[1][3] The specific name yongi honours Dr. Yong Hoi-Sen, a zoologist from the University of Malaya.

[2] Adult males measure 29–31 mm (1.1–1.2 in) in snout–vent length; the size of females is unknown.

The forelimbs are comparatively long and very stout; the fingers have rounded tips and slight basal webbing.

The hind limbs are moderately long; the toes have rounded tips and poorly developed webbing.

[2] The type series was collected from a mossy cloud forest at elevations of 1,954–1,991 m (6,411–6,532 ft) above sea level.