Two large forest Phrynobatrachus (male, snout–urostyle length 42.2 mm; subadult, snout–urostyle length 27.4 mm) were collected from the Mahale Mountains in Tanzania, exhibiting a large tympanum (55%–76% of the eye diameter), large digital discs, and a bright yellow throat in males. A comparison of these two individuals with all described Phyrnobatrachus species was made, and they were found to fit the description of P. sulfureogularis, a poorly known species only known from the type locality in Burundi. This new population represents a substantial southern range extension or potentially a similar, yet undescribed species.