.. A bait

Worms are generally found to work with baiting fish.

We are not looking for a worm inside the soil or anything. I think this is more of a caterpillar.

Worms, like caterpillars, eat lettuce salad. You have to look closely.

Find some lettuce salad. ( Search the garbage bin near the hamburger booth. )

Look at the lettuce salad in your inventory. You find a red worm. That is your bait. Combine it with your fishing rod.