Carb ice in cars - yes, used to get it on an appropriately named Triumph Spitfire in the 70s.
And on A/c engines - have experienced it on an A65 in a Jodel a number of times, but not as yet on the A65 Luton Minor.
VW engines (on a/c) are also supposed to be prone, but I dont think I ever got it on my VP1 - however, the local Tipsy Nipper I believe is quite susceptible, and I've seen it come in a few times with the prop stopped.
RPM reduction on a VW is quite significant with carb heat applied, and the engine used to sound pretty rough when I applied it on the VP1.