Any food can be frozen, but there are some foods that freeze well and some that don't. It's going to take some experimentation on your part to determine the foods you're willing to freeze because taste and quality is highly subjective and you may be willing to accept changes to the food that other people find unacceptable.
If there's a certain type of food you're wondering about, the best way to find out whether it works as a freezer meal is to try it yourself. Making extra and putting it in the freezer for a week or two before eating it is the only way to find out for sure whether you're going to like something or not. I've found some of my favorite freezer meals this way and I've been surprised more than once when ingredients other sources said shouldn't be frozen turned out just fine when I tried freezing them.
Now, having said that, I can definitively say there are some foods that lend themselves well to being frozen and others that don't do so well in the freezer. Let's take a closer look at some of the foods that freeze well:
Eggs are a strange item, in that cooked eggs don't do well when frozen and tend to turn rubbery, but uncooked egg can be cracked into a container and whisked together and they freeze just fine. Fill an ice cube tray with whisked eggs and you'll have little cubes of whisked egg that can easily be added to recipes. Each cube is approximately 1 egg.