| Stream brown frog, Frog, Montane brown frog, Japanese brown frog, True frog|
The Tago's brown frog or simply Tago frog (Rana tagoi) is a species of frog in the Ranidae family endemic to Japan. It is widely distributed within Japan and found on Honshu, Shikoku, and Kyushu, as well as on some outlying islands. There are two subspecies:Rana tagoi okiensis — Oki Islands
Rana tagoi yakushimensis — Yakushima
These might qualify as species. It can also introgres with its sister species, Rana sakuraii.
Tago's brown frog Wikipedia
These frogs are found in montane areas close to streams in the leaf-litter, or underneath stones in the streams.