The term 'Jolly Man' is often used to refer to two different characters. The first is Roger, a character from the popular children's book series 'The Magic Tree House'. Roger is a mischievous elf who helps Jack and Annie on their adventures. The second is Santa Claus, the jolly old man in red who delivers presents to children around the world on Christmas Eve. Both characters are known for their cheerful and friendly personalities, which is why they are often referred to as the 'Jolly Man'.