Fantasia Ballerinas are a group of professional dancers who specialize in the art of ballet. They are known for their graceful and elegant performances, often accompanied by classical music. The term 'Fantasia Ballerinas' is derived from the 1940 Disney film Fantasia, which featured a number of ballerinas performing to classical music. The crossword solution for this term is 'HIPPOS', referring to the large, four-legged mammals that are often seen in ballet performances.