The froghoppers aka spittlebugs, are a variety of species in thesuperfamily Cercopoidea. They are best known for their nymphs which produce a bubbly mass of froth to hide in. This is actually plant sap which looks like spit, therefore the common name of spittlebugs or spit bugs. They turn the sap into bubbles by pumping their bodies, then use their hind legs to cover themselves. Unlike true spit, this froth comes from the other end. No further comment needed.
|Frog Hopper making froth- Wikimedia|
* See physorg.com for how they jump so far.