Is it bad to eat string cheese that expired 2 years ago if frozen?

Yes, it is bad to eat string cheese that expired 2 years ago even if it was frozen. Even though freezing can slow down the growth of bacteria, it does not kill bacteria or prevent it from growing once thawed. After two years, the quality and safety of the cheese would be compromised, and could potentially make you sick if consumed. It is not recommended to consume expired food items, even if they have been frozen, for safety reasons.