Kinokojin

Kinokojin are little Creatures in TUG who are found in the Deep Forest Biomes at places mushrooms grow.

They seem docile, just sneaking up on you and giggling and running away but they attack sometimes too, not clear what triggered it, was night and I had just chopped down one of the large red mushrooms.

Kinokojin plant mushrooms on any soil that is not tilled for farming. The video suggests that they do not literally "plant" them but instead turn into mushroom spots when cornered or killed.

There is an aggressive version which attacks players without being quoted and steals anything laying on the ground.