Littlejohn joins the No. 7 recruiting class in the country for 2026, per 247Sports.
Students will submit their requests in late July for the upcoming season.
Rafferty was an All-American offensive lineman for the Nittany Lions.
"Penn State enters this new era of college sports in a position of strength and ready to attack this new collegiate landscape."
Polydor is the third cornerback commit for Penn State in the 2026 recruiting class.
The defensive end picked up the injury working out at home over summer break.