Anyone cook a whole turkey in a crock pot/slow cooker?
 

Any suggestions? Does it have to be completely thawed?

Thawed yes 100%
If you need to thaw it more, place it wrapped in cold water and either change the water every 30 minutes, or leave cold water running. Cold water will defrost things faster than hot or anything else. Roughly will do 1 pound per hour or faster with running water.

As for slow cookers - unless you mean a BBQ, why in the hell would you? You will end up with soggy skin which is just bleh. Also know you did not brine it so it will dry out unless you ad tons of liquid and then your braising a turkey which means well it will be moist but fall apart.

Actually I was wrong it was not an entire turkey in my freezer it is just a huge breast. From what I have read you can let it sit in the crock pot with veggies etc all day then broil it for 5-7 minutes to brown and crisp the skin.

Hard to even buy a turkey that will fit in a crock pot.

Don't do it. You will end up with small bones everywhere. Boneless poultry, fine. If it has bones I would not recommend it.