According to the USDA, unused portions of food thawed in the refrigerator can be refrozen. However, there maybe a loss in the quality of food due to the moisture lost during thawing. You should never refreeze any foods left outside of the refrigerator for longer than 2 hours - 1 hour in temps over 90 degrees.
If you are asking if it OK to use, you will have to make that decision. You know how the meat was handled, stored, defrosted and refrozen. If you have doubts about its safety, throw it out.
It depends on how it got unfrozen. If you thawed it in the refrigerator you should be able to freeze it again and be fine, but if it was left sitting out, you could be at risk for food poisoning and it is best to just throw it away.
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Generally, yes, whole wheat buns can be refrozen.
the word "un" in that word unfrozen is a prefix
Frozen batteries last longer unfrozen batteries.
NO
No, it can't
Yes.
no
Yes
As the frozen cupcakes will require extra time to defrost, the unfrozen cupcakes will bake faster.