Teofimo Lopez Trades Massive Body Shots W/ 'The Mountain' In Training Sesh

Star boxer Teofimo Lopez took down Vasiliy Lomachenko ... but could he do the same to the 6-foot-9 beast from "Game Of Thrones"?? Turns out ... he couldn't -- 'cause the two traded body shots during an epic training sesh this week, and Hafthor…