Can a book have more than one protagonist?

Yes, a book can have more than one protagonist. In fact, it is quite common for books to have multiple main characters. Each protagonist can have their own point of view and contribute to the story in their own unique way. This can help to create a more complex and interesting plot, as well as allow the reader to connect with multiple characters. Some famous examples of books with multiple protagonists include "The Lord of the Rings" by J.R.R. Tolkien, "A Song of Ice and Fire" by George R.R. Martin, and "Harry Potter" by J.K. Rowling.