Hydrophylax leptoglossa

The long-tongued frog, also called Cope's frog or the Assam forest frog, is a true frog native to Bangladesh, north-eastern India, Myanmar and western Thailand, and recently reported from Bhutan. It lives near streams in evergreen forest, generally at moderate elevations, below 500m in India and between 600 and 700m in Thailand (Wikipedia, general species account).

Deforestation, fires and agricultural encroachment can pose threats to it. The source opened gives no size, colour or breeding details, and the Bhutan record is described only as recent, so none is stated beyond that.