Yes, a few are ...
Michael Lewis played 7 seasons with the Saints (2001-2006) and 49ers (2007) and did not attend college. He was selected to the Pro Bowl as a kick returner in 2002. Lewis played semipro football and also in the Arena Football League before catching on with the NFL.
Otis Sistrunk played 7 seasons for the Raiders (1972-1978) and did not attend college. He was named to the Pro Bowl in 1974 and was a starting defensive tackle for the Raiders Super Bowl XI team. Sistrunk joined the Marines after graduating from high school and started playing semipro football after leaving the Marines.
Ray Seals played 9 seasons (1989-1997) for the Buccaneers, Colts, Steelers, and Panthers and did not attend college. He was a starting defensive end for the Steelers in Super Bowl XXX and was named to the second team All-AFC team in 1995. Seals was the player in 1992 that deflected a Brett Favre pass that was caught by Favre and became Favre's first ever NFL completion.
No, Antonio Gates only played High School Football before the NFL.
Dwayne Johnson played football before entering the WWF. He played in high school and college.
Mark Harman played college football before he was an actor
Steve Williams played Division 1 college football at Oklahoma University from 1977-1981. Before that he had played in High School. He never played professional football.
He played football at Florida State University.
He played college football for the University of Pittsburgh and the University of Delaware.
Marvin Harrison played his college ball at Syracuse University.
James Farrior played college football at the University of Virginia.
No, he attended the University of New Hampshire, but he never played college football.
Yes he played on the Amherst football team.
Yes, he played college football in Florida