Ootheca.
A praying mantis egg case, known as an ootheca, resembles a small, brownish or tan foam-like structure, often shaped like a rectangular or oval block. It can measure about 1 to 3 inches in length and has a hard, protective exterior that can blend in with the environment. The case contains numerous eggs and is typically attached to vegetation or other surfaces, providing camouflage and protection for the developing mantis nymphs.
The animal you see is the adult, so no, they do not grow into a larva. The female lays eggs in the fall of the year. The egg case looks like a bit of foam, brown, about an inch across. In the spring, hundreds of baby mantids come out, and start hunting. They grow into adults.
They have babies by mating and then they lay an egg pouch made of foam
Foam
a female muscitoe
A:Sea Foam
An insect that makes foam to protect it's babies. It is called a spittlebug.
You can find the plans for the foam plane called the Kraken in the major search engines.
The foam at the top of a wave is called 'spume'
dier
barm
The white foam on a wave is called "surf" or "surfing."