Drilling is ONLY good where the corners of the kubb can dig into the pitch. Attemptint to drill into frozen ground or ice will only yield unpredictable bounces. Even putting backspin on kubbs is risky since you don't know where, exactly, the kubb will hit the ground and can bounce erratically despite the backspin. On frozen ground or ice, some sort of slide is going to be your best bet.
However, if the ground is frozen, but there is a little grass showing, I have found that a very low drill can work. In the summer time, you generally want the kubb to hit the grass at a high angle of attack to dig into the ground. In the winter, I have found that the kubb just bounces from the impact. If there is grass, though, a low angle of attack can grab the kubb pretty well. You just have to learn to play the surface.