The Berkley Gulp Alive Trout Worms come in several shapes and sizes. The Pinched Crawler is fat, the Fat Floating Trout Worm is skinny (go figure), and the Smelt is a tiny little baitfish looking plastic.
They are all in a jar and have the very effective juice called Gulp Alive. We have used it and we believe it works as good or better than live bait.
I’ve used these Gulp worms in the past, frequently, trolling for trout, and found them to be very effective, if rigged properly.