Hi Chris! You can find lobster at a few restaurants at Walt Disney World. If you want to use your Dining Plan credits for a true lobster dinner,
Narcoossee's at the Grand Floridian is your best bet. The menu there has a Steamed Whole Maine Lobster entree. Dining at Narcoossee's will cost you two credits on the Dining Plan. You'll also find a lobster and crab dinner at
Fulton's at Downtown Disney, but you'll have to pay out of pocket for that meal unless you have the Premium or Platinum dining plans. Fulton's doesn't accept the regular Disney Dining Plan. Earlier this year the Yachtsman at the Yacht Club also had a whole lobster on its menu, but the currently-posted menu doesn't show that entree, so it may have been seasonal. If your trip is later in the spring or summer, it may appear on the menu again, so check the site before your vacation to see if lobster has reappeared there.
Other restaurants at Disney have dishes with lobster in them. For instance at Coral Reef in Epcot, you can order lobster ravioli, and at the Brown Derby in Hollywood Studios, you can enjoy a lobster bisque. The Quick Service restaurant at the Grand Floridian even serves a lobster cobb salad.
We're glad that you're finding the Moms Panel helpful! Please come visit us again with more of your Disney trip-planning questions! We'd love to help!