Dixon cited his versatility as one of his best aspects, while others are impressed with his competitiveness.
Enterline played in 13 games for Manheim Central, catching 80 passes for 1,508 yards and 25 touchdowns.
The redshirt freshman spent last season behind Drew Allar and Beau Pribula.
The Bills signed Johnson to a one-year deal.
While James Franklin said his wideouts have improved during spring practice, the Nittany Lions are experiencing the same struggles they had a year ago.
"We try to keep things simple so we can play fast."