Report: Harvin, Frazier had heated exchange

Vikings receiver Percy Harvin is one of the most explosive players in the NFL.  In more ways than one. His fierce skills come with a fiery (at times) demeanor.  The latter reportedly manifested itself earlier this month, via a “heated exchange” with coach Leslie Frazier. Tom Pelissero of 1500ESPN.com reports, citing “four NFL sources,” that…