I'm going to call the police on some guys doing donuts in an icy parking lot
Why do you want to call the police about that?
It seems dangerous for them and bad for their car.
While it could be nosy to call the police just because someone is messing up their car, It is unsafe for people to drive in risky ways in parking lots. They could hit a pedestrian or other car. If you think they are a danger to the public, call the police.
yeah that's what I'm planning on doing.
You are doing the right thing by preventing potential accident. It's always good to report such reckless behaviour.