Is there a metaphor in the book Bud Not Buddy?

The metaphor of the title character "Bud Not Buddy" represents the protagonist's journey of self-discovery and identity formation. Throughout the novel, Bud grapples with the dualities of his existence as a homeless boy in the Great Depression, searching for a sense of belonging and authenticity. The shift from being called "Buddy" to claiming the name "Bud" symbolizes his transition from a mere placeholder in the lives of others to an individual embracing his own identity and agency.