These insects are most commonly referred to as snout beetles. They belong to the family Curculionidae, which are the "true" weevils.
Wireworm. Larvae of a click beetle.
maggot
a caterpillar.
Caterpillar
a Caterpillar
maggot
Case bearing Moth
This stage of an insect's life-cycle is called larva.
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A Willy Worm of course!
Worm
The scientific or taxonomic name would be Ceratomia catalpae.
The scientific or taxonomic name would be Cydia pomonella.