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 | Myths and Folklore Wiki | Fandom
Kappa (folklore) - Wikipedia
Kappa holding a cucumber - Stock Illustration [68006635] - PIXTA
A Creature That Loves Cucumber As Much As Human Anuses - Yokai Toons
Kappa + “cucumber “ - Kappa - Sticker | TeePublic
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