Ingerophrynus divergens is a small forest toad that inhabits the forest floor of primary and secondary lowland forests. It is most often encountered at night, when individuals forage actively among leaf litter for insects. The type locality is given simply as “Sarawak.”

Adult males reach up to approximately 40 mm in snout–vent length, while females measure about 40–55 mm. The body shape is intermediate between the relatively slender Ansonia and the more robust Duttaphrynus. The limbs are short. The head is broad and heavily ossified. A distinct bony crest is present on the dorsal surface of the head, medial to the eyes on both sides.

Dorsal coloration is brown with darker markings that closely resemble leaf litter; some populations show an orange-brown tint. In certain individuals, a fine vertebral stripe may be present. This coloration provides excellent camouflage on the forest floor. The iris is bronze to golden, with pronounced dark reticulation.

The skin is covered with keratinized warts and feels distinctly rough to the touch. As in all members of the family Bufonidae, the skin produces defensive secretions that may be toxic. In I. divergens, however, these secretions are usually not released in noticeable amounts. Nevertheless, direct handling should be followed by thorough hand washing.

The tadpoles of Ingerophrynus divergens are small, reaching approximately 20 mm in total length, and exhibit the typical bufonid tadpole body form. They occur in intermittent pools of stagnant or very slowly moving water, usually over silty or sandy substrates. Tadpoles observed so far consistently show a dark spot on each side of the dorsal trunk. The nares are relatively large and bear a distinctive medial triangular prominence.