Debih, they are just pancakes but with a slightly thicker batter and slightly more mix in the pan. The fillings I make myself and are whatever is in, the fillings are already cooked before they go in the pancakes. The pancakes are sealed with a brush of the pancake mix round the edge while they are still hot. I make a pancake, fill it, seal it, then move on to the next.
They do freeze, but don't last long round here before they are all gone - my daughter is a BIG fan.
To reheat I have a mini oven and put them in there on about 180c for 25 mins or till piping hot all through.