Pauly D to Khloe: Give Tristan Thompson 2nd Chance!

[[tmz:video id="0_wl1idknr"]] Pauly D is calling for MERCY for Tristan Thompson ... saying Khloe Kardashian should give the dude a second chance after getting caught cheating on her during her pregnancy. "OHHHHH," Pauly told us while outside 1 OAK…