There are plenty of great synonyms for the phrase "little boy", all of which can add depth and nuance to your writing. Some options include tyke, lad, youngster, youth, boyish, juvenile, juvenile delinquent, and kid. Each of these words carries its own connotations - for example, tyke might suggest playfulness and innocence, while juvenile delinquent implies mischief and troublemaking. Your choice of synonym will depend on the context of your writing and the tone you're trying to convey. Regardless of which word you choose, employing synonyms is a great way to keep your writing fresh and engaging.