tree toad vs toad frog

tree toad and toad frog both are nouns.

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

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

tree toad: arboreal amphibians usually having adhesive disks at the tip of each toe; of southeast Asia and Australia and America
toad frog: any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species

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

tree toad (noun)	toad frog (noun)
arboreal amphibians usually having adhesive disks at the tip of each toe; of southeast Asia and Australia and America	any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species