This is info. I copy and pasted from a cooking site.
Whole Chicken
A 4-to-5-pound frozen whole chicken can be cooked in a Crock-Pot on low for 10 hours. When cooking a whole frozen chicken, one cup of warm liquid should be added before setting the poultry in the slow cooker. Warm liquid acts like a cushion against sudden temperature changes. For a larger frozen whole chicken, four additional hours at low or two hours at the high setting will be required.
Misconceptions
Some cookbooks suggest that frozen poultry thaws and is held at a dangerously low temperature when cooking in a Crock-Pot. Bacteria in raw chicken multiplies between 40 degrees and 140 degrees Fahrenheit. A cooking temperature of 160 degrees should be achieved to safely cook chicken. Slow cookers set to the "low" setting that cook at a minimum temperature of 160 degrees and 200 degrees on "high" will safely thaw and heat chicken for long-term cooking