[1] The specific name njiomock means "eleventh" in Oku language and refers to the name "Phrynobatrachus sp.

11" that Jean-Louis Amiet [fr] used in 1978 to refer to a specimen collected near Lake Oku.

[2] Phrynobatrachus njiomock occurs in or close to streams in montane forest at elevations of 2,219–2,400 m (7,280–7,874 ft) above sea level, as well as near the shores of Lake Oku at 2,219 m a.s.l.

[2] Phrynobatrachus njiomock used to be the most abundant frog at Lake Oku (apart from the fully aquatic Xenopus longipes),[1][2] but it has declined in recent years; as of 2019, it had not been observed since 2010 despite monthly monitoring in the area.

Although a large portion of the species' small range (14 km²) is within Kilum-Ijim Plantlife Sanctuary, livestock grazing and agricultural expansion occurs within the area.