Saquon Barkley says Baker Mayfield body critics need to BACK OFF ... telling TMZ Sports the dude doesn't have to be shredded to be a good QB!!!
Bake and his closest friends let loose on a Caribbean vacay last week ... and naturally, the guys posted a few pics from the trip.
Of course, the writer of this post has literally ZERO grounds to criticize the Cleveland Browns star ... but some people pointed out Mayfield's physique was just a tad different from Saquon and Sterling Shepard's.