Will my iPhone be damaged if it's in the freezer a lot?

I work at McDonald's and have to go into the walk in freezer several times throughout the day and I'm worried that the phone being in freezing weather and then back to hot and sweaty weather several times will damage it

Unless you are staying in there for extended periods of time, the phone will not have time to cool off too much, therefore I would say no.

Is this he same phone you carry outdoors in the winter…, and then bring indoors? Thinking things through isn't your strong suit, is it? Find something realistic to worry about.

Yes it would! When you ever turn your iphone on it will say that your temperature is too cold, and it will ask you to make sure it is in a hot place, but not too hot or otherwise it will also say that your temperature is too hot!