Plazz decommitted from Penn State in June.
"We take a lot of pride in what we do and we look forward to coming over and making people happy on gamedays."
With some notable commits seeing upgrades in their ratings, the Nittany Lions can let their top players develop without adding more recruits to the class.
Across seven games for Friendship Collegiate Academy in 2022, Cook registered seven total tackles, including six for a loss, according to MaxPreps.
Johnson was sentenced to six months of Accelerated Rehabilitative Disposition.
As Singleton prepares for the 2023 season, he first wraps up his second offseason of NIL partnerships.