Jonah is an elderly frog who lives in a field near Wartwood Swamp.
For an unknown reason, Jonah has had a grudge against Sadie Croaker for quite a long time, and wants to murder her.
He is dull-green frog, with a lighter underside. He has yellow eyes and black hair parted on either side. When "cleaned up," he wears a red-banded top hat, a suit with no undershirt, and pants that roll up at the ankle.
Being an assassin, he isn't friendly in the slightest, unless pretending to get what he wants. He doesn't have much class either, and seems to live as a part-time farmer. He is a master deceiver, tricking Sprig into revealing where Sadie lived and posing as her long-lost lover.