Georgie Denbrough is played by Tony Dakota [from Who's Harry Crumb, 21 Jump Street and MacGyver], and since he was killed by Pennywise, his ghost is played by Tony Dakota too.
Georgie was playing with a boat Bill made for him when Pennywise lured him close to the sewer and killed him. Later, Pennywise appears as Georgie to mess with Bill's mind. You can explore the rest of InfiniteCoolness.com using the links at the top of the page, and if you're looking for a picture that's not here, try posting a request on the board. Thanks for stopping by!