Spiny Tree Frog

Zhangixalus achantharrhena is a frog in the family Rhacophoridae, endemic to Sumatra and known from a number of high-elevation localities from Aceh in the northwest to Lampung in the southeast. The specific name comes from the Greek for thorn and male, referring to the skin of males being covered in tiny spicules. The back is bright green with reddish spots (Wikipedia, general species account).