Occidozyga laevis inhabits puddles and swamps. We found it in alluvial forests, muddy wallows, and at edges of forest ponds. It is a mostly aquatic frog that sits submerged in the water, only eyes and nostrils protruding. 

The species most likely is an assemblage of multiple species. Flury et al (2021) identified three genetic lineages from Borneo tentatively places in a "laevis" group. Only wide-ranging sampling and genetic profiling will uncover the true diversity and establish valid species. The specimens in the photos, thus, are assigned to "O. laevis" only tentatively. 

It is a medium sized frog of usually less than 30 mm in males and up to 48 mm in females. The dorsal coloration is brown or grey, sometimes with ocher patches at the neck. Some individuals have a vertebral stripe. The belly is often yellowish.

The tadpoles are predatory. The tail is long and the tail fin is low, but almost reaches the body. The tail tip is pointed and drawn out. In dorsal view there is a white spot on the snout. In Occidozyga, you will rarely find a tadpole without well developed hind limbs. They seem to develop prematurely compared to other dicroglossids. The mouth is terminal in position and the orifice appears quite small.

Tadpoles wait for prey in shallow water. The water may be just enough to cover the tadpole.