"Shakey Heads" have departed a long way from the original technique, which was a basically a jig worm, the only difference being the longer shank and heavier gauge hook for weedless rigging. It allowed you to shake just the head of the worm, hence the name. Like almost all other jig based finesse techniques, it turned into stand up rigging. *See also Ned rig, Sliders, Spot Removers, etc. I don't know what, but the stand up jig has never been given a cool name, and always becomes a trait of another rig.