"there could be larvae burrowed inside."
Nymphs. Cicadas undergo incomplete metamorphosis (they don't have a cocoon, basically), so their juvenile stage is a nymph rather than a larva.
This is definitely the kind of stuff Kumano Plan would love...his own work is stuck at three chapters three years ago(he has more but they ain't on MangaDex),and this hasn't been updated after six years since chapter nine!