Yes, freezing waffles is a great idea. Make a large batch of these birthday cake waffles, eat some then and let the others cool. Once the waffles have cooled completely, I like to freeze them on a plate or baking sheet for 1 to 2 hours to harden. Then, I will put them into a freezer storage bag or an airtight freezer container. It's also good to put a piece of wax paper between each waffle to make it easier to pull out a single waffle at a time. The waffles can be taken out and reheated in the toaster to get the crispy outside or heated in the microwave. Waffles will last up to 6 months in the freezer.