The Round-tongued Floating Frog (Occidozyga martensii) is a species of frog in the Ranidae family. It is found in Cambodia, China, Laos, Malaysia, Thailand, Vietnam, and possibly Myanmar. Its natural habitats are subtropical or tropical moist lowland forests, rivers, intermittent rivers, swamps, freshwater marshes, intermittent freshwater marshes, ponds, irrigated land, and canals and ditches.