How long is chicken good once it is thawed?
Once chicken has been frozen and thawed, it should be cooked or discarded within 24 hours. Once it is cooked, it will last a few more days in the fridge if stored below 40 degrees F.
It isn't generally safe to refreeze raw food. This is especially true for chicken, which is contaminated with salmonella at scary-high rates. If the chicken has thawed, it isn't generally safe to refreeze it and eat it later. This is especially true if it is thawed in room-temperature water rather than being thawed in the refrigerator. Once thawed, the chicken should be cooked fairly quickly. Once cooked, it can then be frozen for later consumption.
No, frozen is frozen. But you can refreeze something that has been thawed. You can refreeze thawed meat long as there are still ice crystals on it. Once completely thawed then you need to cook it first then refreeze. This applies to solid pieces only, ground meat once more than half thawed needs to be cooked first then refrozen always.