By Tzvi Machlin You’d think that as the most decorated Olympic athlete of all-time that Michael Phelps would be instantly recognizable by just about everyone in the world. Unfortunately for him, the NFL world doesn’t seem to have kept tabs on his Olympic success. As a result, he’s been confused for one particular NFL player multiple times. Former NFL quarterback Eli Manning recently tweeted that he often gets confused for Phelps. He said it has happened to him five times already. “I wonder if Michael Phelps gets mistaken for me as much as I get mistaken for him,” Manning tweeted. “I just had n…