Larva

Noun

 * 1) A stage of growth for some insects, in which they are wingless and resemble a caterpillar or grub after hatching from their egg
 * 2) An animal in the aforementioned stage.
 * 3) A form of a recently born or hatched animal that is quite different from its adult stage.

Thesaurus
Anlage, Masan, apparition, appearance, arachnid, arthropod, astral, astral spirit, aurelia, banshee, beetle, blastula, bug, caterpillar, centipede, chilopod, chrysalis, cocoon, control, daddy longlegs, departed spirit, diplopod, disembodied spirit, duppy, dybbuk, eidolon, embryo, fetus, fly, form, germ, germen, ghost, grateful dead, grub, guide, hant, harvestman, haunt, hexapod, idolum, immateriality, incorporeal, incorporeal being, incorporeity, insect, lemures, maggot, manes, materialization, millepede, millipede, mite, nymph, nympha, oni, phantasm, phantasma, phantom, poltergeist, presence, pupa, revenant, rudiment, scorpion, shade, shadow, shape, shrouded spirit, specter, spectral ghost, spider, spirit, spook, sprite, tarantula, theophany, tick, unsubstantiality, vision, walking dead man, wandering soul, wiggler, wraith, wriggler, zombie, zygote