A knight of the seven kingdoms by George R. R. Martin

A young, naïve but ultimately courageous hedge knight, Ser Duncan the Tall towers above his rivals--in stature if not experience. Tagging along is his diminutive squire, a boy called Egg--whose true name is hidden from all he and Dunk encounter. Though more improbable heroes may not be found in all of Westeros, great destinies lay ahead for them.