Toney is the third Nittany Lion to declare for the draft so far this cycle.
Dixon is the second player to join the Nittany Lions through the transfer portal this month.
Chris Godwin and Miles Sanders each scored a touchdown in the penultimate week of the NFL's regular season.
The defensive end is currently projected as a first-round pick by many.
"I've been wanting to do that my whole life. I love you, mom."
Shelton is the second Penn State defensive lineman to enter the transfer portal Wednesday, joining Judge Culpepper.