Abura-sumasi

Abura-sumashi (the original Japanese spelling) translates as "oil squeezer".

In Japanese folklore, a creature that looks like a squat little man with a big ugly head that looks like a potato or a stone. It is believed that this look is inspired by the works of mangaka Shigeru Mizuki.

These are the restless spirits of oil thieves who escaped from pursuit in the forest. Sometimes they appear out of thin air, but more often they just make sounds (and even communicate with travelers), remaining invisible.