I think there's just the one, right? At Confisco Grille? I tried to get a reservation for this breakfast, the Grinch is there in December I think and I got the number for the Grinch breakfast from past year's, but it was just some lady's VM. I left her a message but she never called back ... shocker.

From what I've read reservations are much easier to get at US than Disney, and most can be gotten day of in the park, but for character meals you would think you'd need to do it earlier, right?
Just found
this thread, which has very helpful advice and a list of phone numbers.