true frog vs toad

true frog and toad both are nouns.

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

As nouns, toad is a hypernym of true frog; that is, toad 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: 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 frog.

true frog (noun)	toad (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