The Japanese Legend of the Kappa - Spooky Spirits of Japan Ep. 1 #yokai - YouTube
kappa
The adorable frog-alligator-platypus tetranodon is a mix of a kappa, a water dwelling yokai, and a sumo wrestler. It even eats cucumber-like slugs (on the monster hunter twitter), much like the kappa. :
Kappa Monster Hunting in Tono - Tono, Iwate - Japan Travel
A Creature That Loves Cucumber As Much As Human Anuses - Yokai Toons