Linden spent one season in Hockey Valley, where he led the team in assists and scored the second-most points.
The Williamsport, Pennsylvania, native has two years of eligibility remaining.
Despite a heartbreaking elimination from the NCAA Tournament, Penn State ultimately took a step forward by defying expectations.
Washington's effectiveness in the air and after the catch makes him an enticing NFL draft prospect.
Mitchell is the second cornerback to join the class.
Cottrell has committed to Penn State after earning a preferred walk-on offer in January.