Mudmunch is a Rank C Classic Yo-kai of the Brave Tribe.
Mudmunch looks like a giant blob of mud, which might explain his name. He has one eye and pointy teeth, the teeth on the top are all yellow while the ones on the bottom are all white.
Mudmunch is based on the youkai Dorotabo, which is this Yo-kai's Japanese name, whose name means "muddy rice field monk". He was originally the ghost of a rice farmer who died before he could reap the fruits of his hard work, and has since haunted his beloved fields. Every night he surges from the ground, crying out "Give my rice fields back!", driving off anyone trying to appropriate them and cursing those who have neglected it into ruin. He appears as a one-eyed old man with three-fingered hands emerging from the muddy fields, his skin tanned from days spent working under the scorching sun.
The three fingers are related to the Japanese belief that a human hand's five fingers represent three vices and two virtues: anger, greed, ignorance, wisdom, and compassion. Thus the dorotabo's hands lack the two fingers of virtue, symbolizing his anger at the vices that led to the ruin of his lifework.
However, Mudmunch's design diverges from the original tale, sporting regular five-fingered hands.