Some synonyms for the famous character "Huckleberry Finn" could include "Huck Finn," "The Adventures of Huckleberry Finn," or simply "Huckleberry." These names all have a connection to the classic novel by Mark Twain, which follows the misadventures of young Huck as he navigates life on the Mississippi River with his friend Jim, a runaway slave. "Huck" might be the most informal of these terms, used by those who are familiar with the character but don't necessarily know the full book title. "The Adventures of Huckleberry Finn" is more formal and might be used in academic or literary contexts.