I picked up some frozen salmon burgers from work since they were on sale and a steal of a price. Serving is is 4 oz. Whenever I weigh my fresh meats, I weigh it as 3 oz cooked. So whatever macros chicken has, for example, even though a serving is 4 oz, since I weigh it cooked, I use the same macros, but at a serving of 3 oz instead of 4. Is it the same for a frozen product, I would assume so since it was never cooked.