The crossword solution for the term 'accessory for Frosty' is 'PIPE, ' which is a four-letter word. A PIPE is a cylindrical tube that is used to transport liquids or gases, and it is also commonly used as an accessory for the popular snowman character Frosty the Snowman. In the classic Christmas song, Frosty is described as having a 'corncob PIPE and a button nose, ' which is a reference to the PIPE he uses as an accessory.