The Biggest Snowman Ever by Steven Kroll (2005)
When the mayor of Mouseville announces the town snowman contest, Clayton and Desmond claim that they will each make the biggest snowman ever. But building a huge snowman alone is hard! They work and work, but their snowmen just aren't big enough. Soon they have an idea. As the day of the contest approaches, Clayton and Desmond join forces to build the biggest snowman ever.