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Marshmallow frogs are squishy little frog-like beings, of which there are multiple types. All of these types are tameable (some easier than others) and will help you in different ways. Their society is ant-like, with a queen and special roles for different jobs, though with a much easier lifestyle. They can be eaten (but if you do so you are as heartless as Steve). P.S. Steve had his heart ripped out by a cheesetaker in level 11.5. The food resources they need are anything that would be considered a plant.
Each type has a different way of behaving. One thing in common is that they all have above-average intelligence (though only the queen can talk.)
BUILDERS- These marshmallow frogs have a natural aptitude for building, they use this to make the colonies home. They do this using whatever scraps can be found in the level. If they don't have any scraps they will break bigger objects down to use. To tame them you must give them a good amount of scraps. Then ask them in a firm voice what you wish for them to build, if they build it you have tamed them, if not then either try again or find a new frog.
ATTACKER- These marshmallow frogs attack any enemies of the hive using acidic marshy sludge. They see everything as an enemy until tamed, then they will only attack if commanded. To tame them you must beat them in a fight (in other words capture them and keep them until they stop trying to fight you). After this, they will attack whatever you tell them to.
QUEEN- The queen is the only one capable of speech, usually they don't come out, but if you tame enough frogs they will. They will ask you to become their master, if you say yes the queen will be able to control people and entities (with some exceptions). It can only do so for some time before it needs to stop (3 hours total). You need about 50 frogs for the queen to come out.
They are all pretty much the same, with marshmallow insides... and outsides... yeah they are just marshmallows. But the difference between them is as follows, attackers have an organ to produce and hold the acid they use. Builders have much harder skins for breaking things, and the queen has a more complex brain and is much bigger.