Hi Donna:
I've never heard of the Sponge Bob character. Thankfully, there are many more famous and fun characters you can visit while at Disney World. I suggest making a reservation at
Chef Mickey's. At breakfast at Chef Mickey's, you can enjoy a huge breakfast buffet (including eggs, waffles, pastries, cereals, and more) with Mickey, Minnie, Donald, Goofy, and Pluto. The characters are also around at Chef Mickey's for dinner, where you can enjoy a large dinner buffet including roast chicken, beef and an awesome sundae bar.
If there are other Disney characters your son would like to meet, when you get to the parks, pick up a complimentary Times Guide. Along with providing information regarding show times, parades, and special events, the Times Guides generally include character greeting times and locations.
Enjoy your vacation and good luck.