On this page he skipped a rock on the same lake in Alaska. To see if the sound was real And if he. Hold replicate it.
On this page scientist explain that its not just the ice in Alaska. You can make the sound at any frozen lake
This article explains why the ice made the sound. And that you can do it you self
This article and video explains why the ice makes the sound .And also that the star wars movies used the same technique to make the iconic blaster sound