The word “dragon[s]” is mentioned in the Book of Mormon three times. The first is in 2 Nephi 23:22, but is taken from Isaiah, 

"And the wild beasts of the islands shall cry in their desolate houses, and dragons in their pleasant palaces; and her time is near to come, and her day shall not be prolonged. For I will destroy her speedily; yea, for I will be merciful unto my people, but the wicked shall perish."

The Nephites obtained from the Brass Plates before they left Jerusalem (1 Nephi 5) which contained this prophecy of Isaiah.

The word “dragon” or “dragons” was used in the Old Testament numerous times. This beast is sometimes referred to as living in the sea or fresh water with grass, reeds, and rushes. This would lead us to think of the crocodile, which could in many ways be construed as a dragon. In the New Testament John the Revelator used the word “dragon” in Chapter 12 of Revelation, solely to refer to evil forces, in other words, Satan. 

Now let us look at the word “dragon” as used in the other two verses in the Book of Mormon: Mosiah 20:11 - describes the people of Limhi who, fought for their lives and their families,

"...they were not half so numerous as the Lamanites. But they fought for their lives, and for their wives, and for their children; therefore they exerted themselves and like dragons did they fight."

Alma 43:44 - describes the people of Limhi who, fought for their lives and their families,

"And they were inspired by the Zoramites and the Amalekites, who were their chief captains and leaders, and by Zerahemnah, who was their chief captain, or their chief leader and commander; yea, they did fight like dragons, and many of the Nephites were slain by their hands"

But Wait!  There's more...

"The Chepewayan Athapascans told of a great water which the soul must cross in a stone canoe; the Chilians, of a western sea, where toll must be given to an evil hag, who plucked out an eye if payment were not forthcoming; the Algonquins, of a stream bridged by an enormous snake. The Aztecs called this river Chicunoapa, the Nine Rivers, where the departed must pay toll to a dog and a dragon. It will be recollected that the brothers in the “Popol Vuh,” cross a river of blood."  -- Popol Vuh, p. 48

Honorable Mentions

DID GLOOSKAP KILL THE DRAGON ON THE KENNEBEC? By ROSLYN STRONG

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://neara.org/pdf/dragon.pdf&ved=2ahUKEwiHi_rPjfP_AhUMEGIAHe_nAiw4ChAWegQIBhAB&usg=AOvVaw3Z2FLRCB4vgD-wKUO7BDCD

Ojibwa

https://www.google.com/amp/s/mikelbclassen.com/agawa-native-american-pictographs-lake-superior/%3famp

Black Canyon "Dragon"

https://www.livescience.com/51886-winged-monster-rock-art-deciphered.html

NOTE

President Smith then read Rev. 13:1-8. 

John says, "And I saw one of his heads as it were wounded to death; and his deadly wound was healed; and all the world wondered after the beast." Some spiritualizers say the beast that received the wound was Nebuchadnezzar, some Constantine, some Mohammed, and others the Roman Catholic Church; but we will look at what John saw in relation to this beast. Now for the wasp's nest. The translators have used the term "dragon" for devil. Now it was a beast that John saw in heaven, and he was then speaking of "things which must shortly come to pass;" and consequently the beast that John saw could not be Nebuchadnezzar. The beast John saw was an actual beast, and an actual intelligent being gives him his power, and his seat, and great authority. It was not to represent a beast in heaven: it was an angel in heaven who has power in the last days to do a work.

"All the world wondered after the beast," Nebuchadnezzar and Constantine the Great not excepted. And if the beast was all the world, how could the world wonder after the beast? It must have been a wonderful beast to cause all human beings to wonder after it; and I will venture to say that when God allows the old devil to give power to the beast to destroy the inhabitants of the earth, all will wonder. Verse 4 reads, "And they worshiped the dragon which gave power unto the beast; and they worshiped the beast, saying, Who is like unto the beast? Who is able to make war with him?"

Some say it means the kingdom of the world. One thing is sure, it does not mean the kingdom of the Saints. Suppose we admit that it means the kingdoms of the world, what propriety would there be in saying, Who is able to make war with my great big self? If these spiritualized interpretations are true, the book contradicts itself in almost every verse. But they are not true.

There is a mistranslation of the word dragon in the second verse. The original word signifies the devil, and not dragon, as translated. In chapter 12, verse 9, it reads, "That old serpent, called the devil," and it ought to be translated devil in this case, and not dragon. It is sometimes translated Apollyon. Everything that we have not a key-word to, we will take it as it reads. 

The beasts which John saw and speaks of as being in heaven, were actually living in heaven, and were actually to have power given to them over the inhabitants of the earth, precisely according to the plain reading of the revelations. I give this as a key to the elders of Israel. The independent beast is a beast that dwells in heaven, abstract [apart] from the human family. The beast that rose up out of the sea should be translated the image of a beast, as I have referred to it in Daniel's vision." -- Journal of Discourses, vol 5, pg 345