Ogama are frogs or toads who have lived long enough to be transformed into yokai, thus they gain humanoid intelligence and size as well as a host of magical abilities such as a rainbow-breath that can trap prey, spears by which to attack humans if needed, shape-shifting abilities and a fearsome adaptation of their natural ability to snatch and devour things with their long, sticky tongues.
Ogama are known to become more dangerous as they grow older and larger. Even the relatively "small" Ogama will happily commit evil deeds if given the chance, and when Ogama are fully grown, they may even start to actively hunt humans as prey.