true frog vs toad frog

true frog and toad frog both are nouns.

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

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

true frog: insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs
toad frog: any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species

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

true frog (noun)	toad frog (noun)
insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs	any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species