Uperodon montanus

Uperodon montanus, Jerdon's narrow-mouthed frog, also called the mountain dot frog, mountain globular frog or Malabar Hill frog, is endemic to the Western Ghats. It measures 34-36 mm in snout-vent length and is brown above with dark spots. Unlike most Indian microhylids, whose egg masses float on the water, its egg masses are attached to a tree trunk just above water level or placed on a floating leaf (Wikipedia, general species account).

Males have a single throat vocal sac that expands to a sphere when they call. They call after heavy rains in June or July, beginning after sunset and continuing all night while floating in small ponds. Females approach calling males and the pair mate in axillary amplexus (Wikipedia, general species account).