The biggest kind of frog is the Goliath frog (Conraua goliath). They come from Cameroon in West Africa. Their bodies can reach the size of nearly a foot (30 cm) long. The Conraua Goliath weighs as much as a large housecat, about 3.3 kilos! Not to be confused with the Goliath Tree Frog. The Goliath tree frog is the largest of the tree frogs. They get to be a little bigger than golfball size. They are cousins of the viatnamese tree frog.