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. :
Japan Society - Kappa - Water Goblin A creature with frog-like skin, a beak, a tortoise shell on the back and a plate on its head that is filled with water. Despite
The Kappa by TickleMeCthulhu on DeviantArt
Kappa Pride Png - Sad Frog, Transparent Png - kindpng
Kappa and Japanese Folklore | Japan Experience
3D Printable Kappa Climbing / Turtle Frog Hybrid / Japanese Mythology / Water Cave Encounter by Epic-Miniatures
Kappa Monster Crouching Drawing, Art Print | Barewalls Posters & Prints | bwc47705938
Japanese Kappa: The Yokai That Loves Butts
I am a kappa. It is not a frog.(English) by Romi sticker #2529450
Yokai Monsters: Kappa by Loneanimator | Kappa monster, Japanese folklore, Creature design