Raorchestes tuberohumerus

Raorchestes tuberohumerus, the Kudremukh bush frog or knob-handed shrub frog, is a small shrub frog endemic to the Western Ghats, where it is found in Karnataka and Kerala. The source gives male snout-vent length as 22-19 mm (reversed in the original), so about 19-22 mm (Wikipedia, general species account).

It is recognised by a sub-elliptical snout, golden-brown iris and a humerus bone that slightly projects on the underside near the shoulders. The back is light grey with spinular projections, and the groin has prominent yellow patches with brown (Wikipedia, general species account).