Suiko (水虎 – Water Tiger) is a type of Yōkai depicted in the Konjaku Gazu Zoku Hyakki and the Wakan Sansai Zue, it’s home is said to be the Sushui River in China.
This creature has the shape of a small child, and resembles a pangolin, with knees that are as sharp as tigers claws. At times it is considered as another type of Kappa.1
1. Yoda, H. and Alt, M. (2016) “Japandemonium: Illustrated: The Yokai Encyclopaedia of Toriyama Sekien.”. New York: Dover Publications, Inc.