Half-Troll Traits:

Ability Score Increase. Your Strength score increases by 1 and your Constitution score increases by 2.

Age. Half-trolls age more quickly than humans, reaching physical maturity at around 12 years old. Though their powerful metabolism grants them good health and staves off the physical decline of old age, it also reduces their overall lifespan, and they usually don't live as long as their human counterparts do, at 60 years old.

Alignment. Though their drives are weaker than those of their troll parents, half-trolls are still very passionate and individualistic. Most are chaotic, while almost none are lawful.

Size. Half-trolls are smaller than full-blooded trolls, but are noticeably larger than most humanoids, standing from 6 to 8 feet tall, with as much as an extra foot of height gained from straightening up. Your size is Medium.

Speed. Your base walking speed is 30 feet.

Darkvision. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

Cast-Iron Gut. You have advantage on Constitution saving throws against diseases, ingested substances, and effects that rely on inhalation of gases. In addition, you can eat, and live off of more types of foods that most creatures cannot. Such as soft metals, bark, and stone.

Keen Sense. You have advantage on Wisdom (Perception) checks that rely on smell.

Regeneration. You can tap into the trolls greatest ability to stave off damage. As a bonus action you can expend a Hit Die to regain lost hit points. Once you do this, you cannot do it again until you finish a short or long rest

Thick Skin. Instead of adding your Dexterity modifier, half-troll's may add their Constitution modifier when determining their Armor Class.

Voracious. You're almost always hungry, you must eat as much food and drink as a Large size creature,  four times as much as a Medium creature, each day to stave off starvation.

Languages. You can speak, read, and write Common and Giant.