fire-bellied toad vs toad frog

fire-bellied toad and toad frog both are nouns.

Word	Noun	Adjective	Verb	Adverb
fire-bellied toad	Yes	No	No	No
toad frog	Yes	No	No	No

As nouns, toad frog is a hypernym of fire-bellied toad; that is, toad frog is a word with a broader meaning than fire-bellied toad:

fire-bellied toad: toad of central and eastern Europe having red or orange patches mixed with black on its underside
toad frog: any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species

Other hypernyms of fire-bellied toad include anuran, batrachian, frog, salientian, toad.

fire-bellied toad (noun)	toad frog (noun)
toad of central and eastern Europe having red or orange patches mixed with black on its underside	any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species