Phyrnoidis aspera is one of the two large river toad species. The major poison glands behind the eye and above the ear (parotic glands) is fragmented into a series of warts of which the biggest one is roundish in shape (as opposed to a long thick parotic gland in Phrynoidis juxtaspera).

Adult males 70–100 mm snout-vent length, females 95–140 mm.
The female on the photos was found on a rock in Sungai Rayu, Kubah.

The diet is mostly ants.

No tadpole images available at this time.
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