Question

What is the meaning of all toads are frogs but not all frogs are toads?

Answer 1

But not all frogs are toads." Truetoads, to parse it out, are members of the family Bufonidae, which in turn falls under the order of amphibians commonly calledfrogs, and known officially as Anura, meaning "without a tail." ... "Frogs are called ëtoads' when they have a thicker, drier skin," Hamilton adds.

Answer 2

Toads are Lower stage amphibians of frogs so they can be called as frogs while frogs are fall in upper stage so they can't be called as toads.