Disclaimer...I have no experience acclimating "iced" crawdads.

Back in my tropical fish aquarium days when I brought a fish home from the store I would float the bag in the aquarium for 20 minutes, or so, to let the temperature in the bag equalize with the aquarium temperature, then add some aquarium water to the bag to help the water chemistry equalize as well...give it another 20 minutes and then release the fish into the tank.

Since crawdads are not as susceptible to water chemistry as fish, I would think temperature is really the big concern given that the pond water is of decent quality. Your main concern is to NOT change their temperature too fast.

I would remove the ice from the crawdads and allow them to sit indoors for a while (20 -30 minutes) with the bags open. Then move them to the outdoors for a while 20 minutes or so). So long as the critters are moving around fine and moving around more as they warm up...I might even add some pond water to them towards the end, 5 -10 minutes before releasing them in the pond. Just enough to wet them down.

My suggestions are probably overly cautious, but if you have the time, why not spend it with them? I transferred 300 crawdads to my pond last year over many installments from a nearby creek and have not seen but a few since. They are there as there were no predators present...you just don't see them unless you go flipping rocks.

Fish on!,
Noel