Can I defrost chicken to separate then refreeze? If I buy a large quantity of chicken frozen together, can it be thawed, separated, then refrozen safely?
Technically if it was defrosted in safe conditions you could refreeze without too much fear of 
contamination, but that's not the main issue - quality is. Refreezing meat usually results in a horrible, mushy texture, because of the cell damage caused by freezing. Look for individually vac-wrapped parts if you can find them.