Nestle produces the ice cream at Disney. If you see on the bottom of the carts in any park, they all say Nestle. They even make the Mickey-head ice cream bars.
It's about a 12-inch long concoction! When we took our first trip when DD was about 3.5, she had her share of them. It was the perfect remedy for when she was pitching a fit - just give her one of those and she was quiet for a LONG time! Luckily she's almost 6.5 now and usually doesn't have those kinds of fits anymore.