any unit used in linear measurement, as the inch, foot, meter, etc. Origin of linear measure. 1885-1890. First recorded in 1885-90.
Realistically, you could put any icing you wanted on a carrot cake. The wonderful beauty of cooking is that you can make it to your liking. But, the traditional icing that most people put on carrot cake is cream cheese icing.
You can make the whole cake, frost it and still freeze. I do that all the time.....cut the carrot cake into pieces and wrap and freeze. There are only 2 of us, and I make a big carrot cake. I have shredded carrots in the freezer now. I bought 2 10-lb bags of carrots on sale and froze some.