Metaphrynella sundana is a common frog in primary and secondary rainforest of the lowlands and hilly terrain up to ca. 1050 m asl. It is a small frog (up to 30 mm) with tuberculate skin texture and considerable variation in coloration and texture. The toe pads are expanded and make it a good climber. It also jumps well despite the stocky appearance, but normally prefers to walk. 

Males call from tree hole or other suitable phytothelmes such as bamboo internodia. Males call with a piping note, emitted at regular slow intervals. The males are able to adjust their call to the resonanz frequency of the tree hole they are calling from. Obviously that maximizes attractiveness to females that approach the hole for reproduction.

Despite the abundance of the species, we have not found tadpoles so far and scientific descriptions of tadpoles do not exist.