Toad

Toad is a giant frog that dares to challenge creatures at its size. It carries several Roda Frogs with all the time.

Ragnarok Online II
In RO2, the monster known as Toad resides in Payon Forest. However, the monster that most resembles RO's Toad is the level 10 Culvert Toad which resides in the Prontera Culverts.