Food which has been cooked can be frozen, even if it was frozen prior to cooking. BUT Frozen food which has been thawed, but not cooked, should never be re-frozen. Nor should food which was cooked, frozen and thawed.
You can if it was deep-frozen raw chicken which was defrosted and then thoroughly cooked in the oven. If the cooked chicken is then deep-frozen it can be defrosted (thawed) and eaten, but should not be deep-frozen a third time.
All meat can be defrosted and then refrozen. It is safe to eat, but will not be as tasty and juicy if meat had not been frozen. This is not a safety issue but a culinary one.
You can use a slow cooker with either frozen or defrosted meat. The recipe should state which you use or the cooking time and temperature will have to be adjusted. Frozen meatballs are excellent in a slow cooker.
You should not take risks with chicken, it must be defrosted before it is cooked, you can defrost frozen chicken in a microwave or drop the meat into warm water and leave for at least an hour to defrost, and check they have before you cook them.
It is not wise to cook a lamb joint from frozen, the centre of the joint would not cook in time and may still be raw when the outermost part of the joint is cooked, the meat should be defrosted in the fridge overnight.
The meat arrives raw and frozen and is cooked via broiler from that frozen state.
Yes, provided it is thoroughly cooked.
To determine if the pork chop is fully cooked, use a meat thermometer to check that the internal temperature has reached 145F (63C). If it has, then the pork chop is fully cooked and safe to eat.
Yes you can, but it will take longer to cook as the meat is frozen.
No it is not recommended on food safety grounds. Unused cooked defrosted meat should be binned after three to four days.
Yes if it is still completely frozen; No if it's thawed at all. As long as it is still frozen and you cook it well, there is not a problem.