Eglitis was released from his signing with Iowa State on December 10.
The Nittany Lions have had the most defensive ends drafted in the NFL since Barnes returned to Happy Valley in 2020.
Fisher was sidelined in 2022 and 2024 due to injury.
Heacock coached with Campbell for 10 seasons.
Enterline has not registered a stat with the Nittany Lions.
The redshirt freshman did not record a stat over two years in Happy Valley.