Japan: A 'kawataro' water imp. From the Kaikidan Ekotoba Monster Scroll, mid-19th century. The kawataro is a variety of kappa or water imp which likes to eat people and to practice sumo.
Doujinshi Kappa Taro (kappa Taro) In other words, Anta is good if me. (Demon... | eBay
KAPPA SHINZO WATERSPRITE GOD by Taro Okamoto on artnet