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. :
TamiArt — Kappa - a river god from Japanese mythology. They...
Kappa with cucumber - Stock Illustration [7628139] - PIXTA
Drew some Kappa, please excuse the lack of cucumber : r/yokai
kappa & cucumber
cucumbers | Cucumbers, Kappa, Animal crossing
Japanese Kappa: The Yokai That Loves Butts
kappa
Unknown: Kappa with Cucumber - Robyn Buntin of Honolulu - Ukiyo-e Search
Kappa loves cucumber by Kimbot1984 on DeviantArt
Kappa holding a cucumber - Stock Illustration [68006635] - PIXTA