Um, sort of, yeah. Maybe souls don't last very long outside of a body or they get all weird like ghosts. Just a guess. But by the time I see them, they've made themselves these little bodies, and-

[She sets her plate down, summons her blade as a handy little knife, then selects one of the larvae and severs its head from its grubby torso, then proceeds to slice a slit up along the back of the head from where its neck ought to be. She slides the end of the blade in against the skull and pries the skin back with her thumb and forefinger to reveal an inch or so of bone on the back of the tiny head, then presents the result to Tucker.]

See? They have skulls at least! Crunchy on the outside, gooey on the inside.