Chiromantis simus
Range
Bangladesh and north-eastern India (Assam, Mizoram, West Bengal)
The Assam tree frog is the frog known to science as Chiromantis simus, the Assam Asian frog, a member of the family Rhacophoridae. It is found in Bangladesh and in north-eastern India, in Assam, Mizoram and West Bengal (Wikipedia, general species account).
The cached source is only a disambiguation page for the name "Assam frog", so no further detail about this species is available from it.