Hart decommitted from the program two days after James Franklin's firing.
Rogers is Penn State's second wide receiver flip of the 2026 recruiting class.
King was waived by the Minnesota Vikings on Thursday.
The Vikings drafted King with the No. 201 overall pick in April.
Freshman Koby Howard reeled in his first career catch in the second quarter against Iowa.
The Big Ten bout will be nationally televised on FOX for the fourth consecutive year.