The Packers drafted King in the seventh round of this year's draft.
Mustipher and Smith were one of nearly a dozen Nittany Lions cut by NFL teams through Tuesday afternoon.
McSorley appeared in two preseason games with the Commanders.
The Nittany Lions will face Iowa, Michigan, Michigan State, and Maryland, Nebraska, Illinois, Ohio State, and Rutgers.
The former Penn State wide receiver recorded 98 catches, 1,658 yards, and 13 touchdowns from 2017-19.
Clifford was Penn State's leader in wins as a starting quarterback, passing yards, total yards, and passing touchdowns.