What reindeer is always on his hind legs trying to impress Santa?

The reindeer that is always on his hind legs trying to impress Santa is known as "Dancer." Dancer is one of Santa's reindeer in traditional Christmas folklore and is often depicted as being graceful and elegant, hence the name. This portrayal of Dancer standing on his hind legs to impress Santa adds a playful and whimsical element to the character in popular culture.