Norm Crosby, the deadpan mangler of the English language who thrived in the 1960s, ’70s and ’80s as a television, nightclub and casino comedian, has died. He was 93.Crosby’s daughter-in-law, Maggie Crosby, told The New York Times that the comic died Saturday of heart failure in Los Angeles.Early in his career, Crosby had realized he needed a gimmick to differentiate himself from the burgeoning generation