Robert Griffin III

Robert Griffin III is getting some serious protection off the field from his father -- who's demanding potential sports agents back off his Heisman Trophy winning son while he decides if he's jumping to the NFL. Sources close to RG3's family tell TMZ, RG2 (aka Dad) has decided any agents who…

You'd think Baylor king Robert Griffin III would go wild after winning the Heisman Trophy this weekend in NYC -- but TMZ has learned, the star QB went straight to Ground Zero instead ... to pay his respects. Griffin family sources tell TMZ, RG3 and several close family members made a beeline from…