Fox in Socks tells the relatively simple story of the eponymous Fox in Socks. Dr. Seuss begins the book by introducing readers to Fox (the aforementioned Fox in Socks) and Knox, as well as the props that accompany them (a box/pair of socks; chicks/bricks, etc.).
Throughout the book, Dr. Seuss describes the situations that Fox and Knox find themselves in with rhyme and whimsy. But, the trouble is that Fox has difficulty with tounge-twisters, many of which are used in describing some of the issues that he experiences (like his ordeals with horrible mud puddle and a noodle poodle, for example).
Unlike Fox, though, Knox is a good sport and strolls away, thanking the Fox in Socks for the fun.