Sonny boy is a term of endearment often used to refer to a young boy or a beloved son. However, there are many other synonyms for sonny boy that can be used interchangeably depending on the context. Some alternative terms include kiddo, youngster, prince, darling, angel, champ, junior, and little man. Each of these words can convey a sense of fondness and affection towards a young person, and they can be used in various settings such as in families, schools, and sports teams. Whatever term is used, it's important to remember the sentiment behind it and the importance of showing love and support to the youth in our lives.