Abura-sumashi

Abura-sumashi (油すまし^?, "Oil Presser") is a creature from the folklore of Amakusa in Kumamoto prefecture. This spirit, which surprises people on the Kusazumigoe mountain pass, is thought to be the ghost of a human who stole oil.

In modern media the abura-sumashi is often depicted as, "a squat creature with a straw-coat covered body and a potato-like or stony head," an appearance inspired by the artwork of Shigeru Mizuki.

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Wikipedia