There was "Mean" Joe Greene and Ed "Too Tall" Jones, "Hacksaw" Jack Reynolds and Jack "The Assassin" Tatum.
And, of course, there was Andre Roussimoff, better known as Andre the Giant.
Wait, Andre the Giant wasn't a football player. He was a professional wrestler, perhaps the most beloved professional wrestler ever: a 7'4", 450-pound ogre with a heart of gold. Andre the Giant certainly looked like he would wreak havoc if someone designed a helmet in his size and lined him up at defensive end. But the French-speaking international superstar never played in the NFL.
Legend has it that he came close.