Franky's narrow-mouthed frog (Mysticellus franki) is a species of frog in the family Microhylidae. It is the only member of the monotypic genus Mysticellus, the mysterious narrow-mouthed frogs. It is endemic to the Western Ghats of India, where it is only known from Wayanad District in northern Kerala state. Taxonomic evidence indicates that its closest relatives are the Micryletta frogs of Southeast Asia.