ribbed toad vs toad frog

ribbed toad and toad frog both are nouns.

Word	Noun	Adjective	Verb	Adverb
ribbed toad	Yes	No	No	No
toad frog	Yes	No	No	No

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

ribbed toad: western North American frog with a taillike copulatory organ
toad frog: any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species

Other hypernyms of ribbed toad include anuran, batrachian, frog, salientian, toad.

ribbed toad (noun)	toad frog (noun)
western North American frog with a taillike copulatory organ	any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species