They do have some, but we have never tried them. I believe Compass Books also has a little coffee shop/pastry shop attached to it, so if you're coming from the DLH or PPH direction, that's an option too. If you're out on Harbor, we love the muffins from Mimi's, even though we know they're probably not good for us. There are also muffins and pastries inside the bakery in Disneyland.
White Water Snacks (in the Grand Californian - very close to the park entrance from the hotel) is another place to try. La Brea Bakery is good though. And there is Blue Ribbon Bakery inside Disneyland.
Yes, they have pastries. You can also find pastries at the bakery inside Disneyand- Blue Ribbon Bakery or check the coffee cart near the roundabout in front of the castle if the line is long at the Blue Ribbon.