Is there a technical term for a housefly that has no wings but is still alive?
Wounded might be a good term for a housefly that has no wings but is still alive.
The young of a housefly is a maggot (eats rotting meat). It becomes an adult housefly after going through a pupae (chrysalis) stage. The young of a grasshopper is a nymph (eats vegetation). It is a miniature version of an adult grasshopper, but is without the wings of an adult (the wings develop later).