What is a butterfly lava called?

The larval stage of a butterfly is a time for growing. The larva, also known as a caterpillar, they spend their time eating on their host plants.

If you meant larva, A caterpillar is the larval stage of butterflies and moths. The caterpillar hatches from a tiny egg and will eventually pupate and turn into an adult butterflyor moth. This larval stage usually lasts from two weeks to about a month.