The proper term for all juvenile insects is "larva" (pl=larvae).
However, one may refer to insects that do not metamorphose (e.g. true bugs, dragonflies, damselflies, stoneflies, mayflies, grasshoppers, mantids, walking sticks, roaches, to name a few) as "nymph".
Each species of insect may have between 3 to 7 (or more) larval stages which are called instars. You wouldn't say instar if you didn't know instar it is, e.g. "first instar", "second instar", etc.- you would just say "nymph" or "larva".
Juvenile Spiders and ticks can be called larvae or nymphs and these are also broken down into instars.
Juvenile forms of insects that do metamorphose (beetles, moths/butterflies, wasps/bees/ants, and flies) are called "larvae" and may not be called nymphs. An instar from any of these orders may also be called a "Stadium (pl-Stadia)" (e.g. first larval stadium, etc.)
However, culture has given rise to some other more loose terms for these types of larvae. For instance, beetle larvae are also called "grubs", fly larvae are also called "maggots", butterflies and moths are also called "caterpillars". Fly fishermen have the greatest variety of nonscientific names for larval insects - so for more find one and ask him/her.
Matt
it is called a larva
Yes, insects hatch from eggs.
I don’t know
Leave them alone. They will hatch out by themselves.
Reptiles hatch from eggs.
They hatch eggs
This mostly depends on the species. For instance, Indian Stick Insect eggs take around six months to hatch, whereas Giant Prickly (Extatosoma tiaratum) eggs can take up to a year.
4-6 months
some stick insects actually hatch when it is quite warm they will hatch in soil if the weather in your house is cold they won't hatch.
Yes - all birds lay eggs, so any young hatch from an egg.
No, Bumblebees are not mammals. a bumblebee is an insect that has an exoskeleton, and unlike mammals which give live birth to their young, lays eggs that hatch into larvae.
Birds lay eggs and hatch them.
it is called a larva
Yes, tortoises lay eggs from which the young hatch from.
Cows are mammals that give birth to live young, they do not hatch from eggs.