froghopper vs spittle insect

froghopper and spittle insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
froghopper	Yes	No	No	No
spittle insect	Yes	No	No	No

As nouns, spittle insect is a hypernym of froghopper; that is, spittle insect is a word with a broader meaning than froghopper:

froghopper: a variety of spittlebug
spittle insect: small leaping herbivorous insect that lives in a mass of protective froth which it and its larvae secrete

Other hypernyms of froghopper include spittlebug.

froghopper (noun)	spittle insect (noun)
a variety of spittlebug	small leaping herbivorous insect that lives in a mass of protective froth which it and its larvae secrete