Caterpillars, for example

• Grubs and maggots
• Tadpole, caterpillar, etc.
• Certain hatchlings
• Grubs, e.g
• Immature forms
• Creepy-crawlies

Wiktionary Word definitions in Wiktionary
alt. (plural of larva English) n. (plural of larva English)

WordNet Word definitions in WordNet
See larva

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Larva \Lar"va\ (l[aum]r"v[.a]), n.; pl. L. Larv[ae] (l[aum]r"v[ae]), E. Larvas (l[aum]r"v[.a]z). [L. larva ghost, specter, mask.] (Zo["o]l.) Any young insect from the time that it hatches from the egg until it becomes a pupa, or chrysalis. During this time ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
plural of larva (q.v.).