Abumi-guchi

An abumi-guchi (鐙口) is a strange furry yōkai, or Japanese monster, that is illustrated in Sekien Toriyama's Gazu Hyakki Tsurezure Bukuro.

Mythology
It is a type of tsukumogami formed from a stirrup, usually one that once belonged to a dead soldier that fell in battle. It is said that the abumi-guchi will wait where it lies for the dead soldier to return.