Phrynobatrachus brongersmai (Parker, 1936) from Liberia has long been considered a synonym of P. ogoensis, following Loveridge (1941). However, this synonymy is highly improbable on biogeographic grounds (Burger and Rödel, 2004).
The IUCN Red List (2010) categorizes this species as Data Deficient in view of continuing doubts as to its taxonomic validity as well as absence of recent information on its extent of occurrence, status and ecological requirements (Burger and Rödel, 2004).
Tongue with a median conical papilla present. Head is moderate, as long as broad. Snout is obtusely pointed, as long as the eye, with obtuse canthus. Nostril is equidistant from the eye and from the tip of the snout. The interorbital space is broader than the upper eyelid. Tympanum is hidden. Fingers are moderate with the first and second equal, and these more than half as long as third. The tips of the fingers are feebly dilated. Toes are moderate, nearly half webbed with the web extending as a fringe on the sides to the tips. Toe tips are dilated into small but very distinct discs. Subarticular tubercles are small but very prominent. Two small but very prominent metatarsal tubercles, an inner oval and outer round, are present. A small rounded tubercle is present on the inner side of the tarsus, connected with the inner metatarsal tubercle by a narrow dermal ridge. The distance between the two metatarsal tubercles is cosiderably less than the distance between the inner and the tarsal tubercle. The tibio-tarsal articulation reaches the eye. Dorsal skin is smooth or with small warts. A fold is present from the eye to the shoulder. Dorsum is brown with indistinct darker markings on the back and cross-bands on the limbs. A light vertebral streak may be present. Jaw margins exhibit large dark brown spots. Hinder side of thighs with a more or less distinct white, black-edged stripe. Venter is white. Throat is dark brown in the male and sometimes spotted with brown in the female. Males have a subgular vocal sac (Boulenger, 1906).
The type specimen is 20 mm (Boulenger, 1906).
This species is known only from its type locality, Lambarene, Ogowe, in west-central Gabon, and (on the assumption that Phrynobatrachus brongersmai is a synonym of this species), from Grand Cape Mount in western Liberia (Burger and Rödel, 2004)
There are no recent records from either country, presumably due to lack of herpetological work within its range, although recent collections of frogs from southern Guinea might refer to P. brongersmai (Burger and Rödel, 2004).