No. Spittle bugs are not harmful to you, however they can be to plants on extremely rare occasions.
In fact, the foam they produce repels ants. Elsewhere on the internet, I read that this foam is not irritating to living tissue, but that its repellent effect comes from attackers (ants that like to eat the spittle bug nymphs) "tasting" the foam with their antennae. Perhaps it would also deter mosquitoes? It might also be useful as a lubricant.
Before you go playing with it, remember when you were a kid and you held a bug in your hand and it messed on you? Kind of gross, but not all that gross? Birds, for example, eat insects whole, whether or not the insect has recently gone number 2. Why do I bring this up? Because the spittle bug makes the foam from its excrement. Yeah, they're insects, so they have no qualms about playing with their offal and burying themselves in it. Evolution may have played a role because spittle bugs that didn't do this were far more likely to get eaten by ants.
In fact, th Spittlebug or Froghopper is NOT harmful. It just sucks the sap from your plants. That's All!
they are helpful not harmful to plants
i guss in a tree or a sap
leafs
Spittle bugs favor the conditions of gardens with a heavy supply of nectar, and over fertilized areas. The bugs are considered to be pest to most gardeners. The best way to get rid of or control the spittle bug is to reduce the fertilizing in the garden.
If you need help I recommend you type in the specific question you need help with
both when getting to close you are screwed but when far its your friend by getting rid of bugs
it can be helpful or harmful
Spittle Bugs live pretty much wherever they can attach there claws to but mainly in plants.
sometimes they are helpful and harmful.
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
Ladybird's favorite food is Aphid (greenfly/blackfly) which attack plants. Ladybirds are a beneficial insect and gardners and Horticulturalists encourage them.