“This jaw-jacking goes on all the time between the opposition, especially between DBs vs. Receivers.”
Mike Golic, of ESPN’s “Mike & Mike”, used to say that the amount of jawing/taunting that was done was proportional to how far one lined up from the ball before the snap. The further away, the mouthier the players tended to be with WR’s & DB’s leading the way.
As for interior lineman, Golic said he was to busy, “trying to get air” between snaps to have much to say to the guy lining up over him.
Yes, much less on the line. But Viking lineman John Randle seemed to get his words in though.