Menk was the language used by the Menk, one of two humanoid species on Valakis. Hoshi Sato was able to learn Menk without much trouble. As of 2151, however, Starfleet's universal translator was unable to translate the Menk language. (ENT: "Dear Doctor") It is probable the Menk language was an offshoot of Valakian, or the other way around.