Three packages off frozen chicken breasts were accidentally left out overnight;in one package, the interior is still partially frozen...can I use? Other packages of breasts still cool to the touch.
By over-night, are we talking 6-8 hours, or 8-12 hours?
I would say if the center is indeed still partially frozen and the rest still cool to the touch as you say, it will probably be okay. Just be sure to fully cook those breasts.
There was a thread about this not long ago. Unfortunately, I get the chocolate baguette when I try to search for it. I'd suggest taking the temperature of the unfrozen ones. If it's above 40 degrees, I'd suggest tossing them.
WHEN IN DOUBT, THROUGH IT OUT. Maybe, if the interior is still frozen, the outside is still cold enough to inhibit the growth of unfriendly bacteria. But chicken is notorious for its ability to carry mischief. Personally I would not take the risk.
Here's an update from the questioner: I cooked the chicken, and although I think it would have been just fine, my husband said "throw it out." So the dogs got some good eatin' that night.