It's Gooey Claus!
It began with a hearty Ho! Ho! Ho! (notice the jolly little belly?)
"His eyes -- how they twinkled! his dimples how merry!
His cheeks were like roses, his nose like a cherry!"
He really got into it after a few Ho! Ho!'s.
"He was chubby and plump, a right jolly old elf,
And I laughed when I saw him, in spite of myself."
(ok, so Gooey Claus isn't chubby and plump. Just go with it.)