I've found several green caterpillars, approx 2"-3" in length, on my tomato plants. These are NOT immature hornworms. Poop is black but not grenade-shaped and the caterpillar itself has no horns, no horizontal striping, etc. They seem to have burrowed into tomatoes but also seem to have woven cocoons. (See photo.) my impression was that fruit worms drop to the ground to burrow, rather than make cocoons, which is the reason for my question.