You bet. Tomato hornworm. Really hard to spot because it is so well camouflaged, and then when you finally see it you can't imagine how you missed it! Even small they eat voraciously; full grown they'll defoliate large swaths quickly. To find them, look for their frass — their poop — little dark pellets on leaves, then start searching just above it.
My own pix aren't so great, but plenty of photos online.