Yes. Place the uncooked crumbed schnitzels onto a baking sheet and freeze until solid. Then transfer them to a suitably sized freezer bag and freeze for up to 3 months. You can let them defrost in the refrigerator before frying, or fry from frozen. If you fry from frozen you should allow an extra minute or two per side in the frying pan. I wouldn't freeze the cooked schnitzels as the coating will just fall off when they defrost.