I know Canada does ice beers like that, I remember seeing the commercials. According to Wikipedia, it's still made in the 'States too. Although apparently it gets watered down again afterwards on your side of the border:
...and you wonder why we tease you about your beers
"Although "icing" increases alcohol content, most of the United States breweries simply add water back into their beer after the icing process to bring the alcohol content back down to nearly the same levels. Otherwise the beer would qualify as a "beer concentrate," which is illegal under ATF rules governing beer production."
I did look into it myself and it's perfectly legal to freeze-concentrate here, I've done it a couple of times and it made my really good maple mead into a phenomenal liqueur-strength sipping drink, and my kind of blah kiwi wine into a much stronger blah that's not much fun on its own but pretty good if I use it to fortify something else. Or soak fruitcake in...
"The main ingredient needed is 'time' followed closely by 'patience'." - The Bishop 2013
"Good grief! If someone wanted to murder you, all they would have to do is ship you a 55 gallon barrel of honey and watch you document working yourself to death!" - Vance G