Chaparana quadranus (Liu, Hu & Yang, 1960) Paa quadrana (Liu, Hu & Yang, 1960) Nanorana quadranus (common names: Kwang-yang Asian frog, swelled vent frog) is a species of frog in the family Dicroglossidae.

[2] Its natural habitats are temperate forest and shrubland, with breeding taking place in small rivers.

It is a common species believed to be declining.

It is threatened by collection for food and also habitat loss.

[1] Nanorana quadranus are relatively large frogs: males grow to a snout–vent length of about 82 mm (3.2 in) and females to 90 mm (3.5 in).