Martin Gramatica -- one of the greatest Tampa Bay kickers of all time -- is vouching for Nick Folk ... saying his beloved Bucs should NOT fire the guy ... at least not yet.
Gramatica won a Super Bowl with the Bucs back in 2003 -- and as you can see in the back of the shot, his trophy room is filled with game balls from making clutch kicks.
So, after Folk crapped the bed on Thursday Night Football -- going 0-3 -- we hit up Martin for his take.