[1][3] It is endemic to the island of Yapen, off the north-western coast of New Guinea, and administratively a part of the Papua Province, Indonesia.

The overall ground colour is yellowish, greyish, or brownish, with brown, reddish or black markings and reticulations.

Most specimens have an hour-glass marking on the dorsum, and many have a broad, light-coloured dorso-lateral stripe.

[2] At the type locality, Choerophryne amomani inhabits primary and secondary rain forest at elevations of 1,050–1,200 m (3,440–3,940 ft) above sea level.

Males call from on or in leaf litter, rarely slightly higher (to 0.3 m above the ground) in hollow plant stems.