[1][2] Adult males in the type series from Wapoga measure 22–23 mm (0.9–0.9 in) in snout–urostyle length (SUL); no females were collected.

The ground colour is beige, grey, or brown dorsally and cream ventrally.

[2][4] The male advertisement call is a long series of notes, lasting from about 10 seconds to half a minute.

[4] Oreophryne wapoga is known from lower-montane tropical rainforests at elevations of 500–1,070 m (1,640–3,510 ft) above sea level.

[2][4] Oreophryne wapoga occurs at low densities, but it is not believed to face significant threats.