Forest creatures are small cute fuzzy things that, as their name implies live in forests.
They also apparently eat your soul while they sleep and try to take over the world with exploding muffins and acorn grenades and the like.
And Ninja squirrels. Hallucinogenic ninja squirrels.
Squirrel: Are you forest creatures?
chipmunk2: your mother's a forest creature.
Squirrel: Oh. I guess I'll just have to kill you then.