The Crackle Back fly that would be a wooly worm would be the Miller's Woolly. It is tied very similiar. It has no tail. The body is dubbing(usually yellow dubbing at the back with gray in the thorax area), wire rib, peacock herl pulled across the back, grizzly hackle palmered through and lead wrap on underbody. It is a very good fly. The creator was Charles Miller.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.