Froghopper
The froghoppers, or the superfamily Cercopoidea, are a group of Hemipteran insects, in the suborder Auchenorrhyncha. Adults are capable of jumping many times their height and length, giving the group their common name, but they are best known for their plant-sucking nymphs which encase themselves in froth in springtime.
Taxonomy
Traditionally, most of this superfamily was considered a single family, Cercopidae, but this family has been split into three families for many years now: the Aphrophoridae, Cercopidae, and Clastopteridae. More recently, the family Epipygidae has been removed from the Aphrophoridae.
Spittlebug nymphs
These families are best known for the nymph stage, which produces a cover of frothed-up plant sap resembling saliva; the nymphs are therefore commonly known as spittlebugs and their froth as cuckoo spit, frog spit or snake spit. The final family in the group, Machaerotidae, is known as the tube spittlebugs because the nymphs live in calcareous tubes, rather than producing froth as in the other families.