Oven cook times - thawed vs frozen
I think your best solution will be to thaw them before you cook them and then follow the same time and temperature settings (unless the contents start out hot, which they do in some cases). As long as you remember move them to the fridge in the morning or the evening before, they should be defrosted enough by the time dinner comes around.

Cooking raw meat from frozen is not (in my opinion) a good idea. The outside will start defrosting and cooking long before the inside even defrosts, which means you're likely going to have issues with very undercooked centers of your food... which is particularly an issue with chicken. And, even if you do wait to take it off the grill until the chicken is fully cooked through, the outside will likely be overcooked and unpalatable.