[3] Frogs with similar call have been observed in the Fakfak Mountains, but it remains to be ascertained that these represent the same species.

The specific name unicolor refers to the uniformly coloured dorsal side of the body.

The dorsal colour is greenish or brownish and uniform, in contrast to most other Oreophryne species that bear large spots.

[2] Natural habitat of Oreophryne unicolor is tropical rainforest at elevations of 500–900 m (1,600–3,000 ft) asl.

They are hard to find as males typically call from perches 3–6 metres above the ground.