Crossword clues for the word: KNOCKKNOCK The word KNOCKKNOCK has appeared as an answer to at least 12 crossword clues on different crossword puzzles. Crossword clues for KNOCKKNOCK Showing 1 to 12 of 12 results Clue(s) *Joke starter "Can I come in?" 1940 cartoon in which Woody Woodpecker debuted Beginning of many jokes Classic joke start Joke start for little ones Question-answer game of the good old days. Rap joke Start of a rap joke? Start of many a corny joke Visitor's second attempt Woody Woodpecker's screen debut