The Redskins and Giants dont play until Oct. 21, but the trash talk has already started.Giants defensive end Osi Umenyiora told WFAN in New York on Wednesday that Redskins rookie Robert Griffin III had not done enough in the NFL earn a nickname.Who is this RG3 guy you guys keep talking about? Umenyiora said according to the New York Post. You talking about Bob Griffin?You guys are giving him a cool nickname already and everything, Umenyiora reportedly added. When he does anything in the NFL were gonna call him RG3. Right now, hes Bob Griffin.Asked later Wednesday to respond to Umenyioras jab, Griffin smiled and offered a respectful retort.Thats Osi for you, Griffin said at Redskins Park. One of my coaches at Baylor called me Bob. Nobody really calls me Bob, but it thats what he wants to call me, thats fine. He doesnt have to call me RG3 at all.