Shovelheads are Sabbat shock troops. They are turned and beaten over the head with a shovel. When they regain consciousness they are sent out to fight. As fledglings, they are the weakest of the Sabbat and the easiest to kill.
It is unclear how many underwent the process willingly but Sabbat have been known to involve kine in their schemes and reveal their nature to them promising a place among their ranks as a reward for services rendered. Whether they chose it or not this method of Embrace leaves the fledgling dazed and throwing them into combat may drive them to frenzy leaving the whole experience a blur. Some shovelheads die before ever realizing they have been sired.