I have a bag of frozen scallops in my freezer - they are within the use-by date,and the bag is fully sealed, but it has 'blown up', as in full of air, I guess.
They look ok. If they smell ok, do you think they'll be safe to consume?
Shellfish can be very problematic. It is possible that the scallops have started to 'go-off' and they are exuding a gas which is causing their sealed bag to become filled with it.
Having said what I have; if they look and smell reasonable and you cook them at a high temperature I would think they should be edible without any side effects.
if the bag is in fact air-tight, and it is now "blown up" I would get rid of it. A gaseous by-product would indicate some type of decomposition, probably bacterial.
Too risky with scallops Salla, sorry. best get rid, your health is more important. I would consider the bag to have ' blown ' meaning something inside it has 'gone off ' .
I am all for saving money and have eaten out-of-date food all my life. I am still here to tell the tale but if the bag has blown up then something inside has gone off. If you die we would all miss you so we are all telling you not to take the risk. You will have to chuck it away this time!
If they were frozen when you bought them and you have kept them at the recommended temperature then I would return them to the shop and get my money back.