larvae, grubs
蠁 centers on the early, worm-like stage of insect life: larvae and grubs. It refers to the immature, often soft-bodied form that hatches from eggs.
蠁 combines 虫 (insect) with 鄉, which likely provides the sound. The character is used for larval insects.
The top 鄉 looks like a village, and the bottom 虫 is an insect. Imagine a village overrun by countless wriggling larvae and grubs.
For キョウ, picture a giant larva in the village shouting 'KYOU!' (like 'kyo') as it munches on everything.