The term 'ice breaker' can refer to a number of different things. In this case, the crossword solutions are PICK (4 letters), SCRAPER (7 letters), INTRO (5 letters), and ROCKSALT (8 letters). A PICK is a tool used to break up ice, a SCRAPER is a tool used to remove ice from surfaces, an INTRO is a short introduction or opening statement, and rocksalt is a type of salt that can be used to melt ice. All of these items can be used in various ways to break up ice.