Paa liebigii (common names: Sikkim paa frog, Liebig's paa frog, Liebig's frog, spiny-armed frog) is a species of frog in the Dicroglossidae family. It is found in Bhutan, Tibet (China), northern India, and Nepal.This relatively common frog is found in stream habitats in high-altitude shrubland. It is locally threatened by habitat loss. Nanorana liebigii are relatively large frogs: males grow to a snout–vent length of about 82 mm (3.2 in) and females to 100 mm (3.9 in). Tadpoles are up to 57 mm (2.2 in) in length.