Huey, Dewey and Louie, often referred to as the 'TRIO', are three fictional ducks from the Walt Disney universe. They are the nephews of Donald Duck and are best known for their appearances in comic books and animated cartoons. The term 'TRIO' is a four-letter word, and the term 'RHYMES' is a six-letter word that can be used to describe them, as they are often referred to as the 'Three Little Ducks'. The term 'Toons' is a five-letter word that can also be used to refer to them, as they are cartoon characters.