Kaijin (folklore)

The Kaijin (海人, literally meaning "Sea Man") is an alleged sea monster from Japan, mentioned in books of the Edo period.
Description.
The kaijin is described as being humanoid in appearance, with chin hair and eyebrows, and webbed skin between the fingers and toes. He also had a skin flap around the waist similar to a Hakama, and could only live for a few days on land. When given food or drinks he would not consume them, nor would he talk to any human that interacted with him. 
According to some, the kaijin was actually a misidentified sea lion or seal.