I've seen the fan-stage frozen from a little puddle of frozen water on an ALF502. Started right up and stabilized at the correct N2. The pilots were pretty stumped why they weren't getting N1 until they shut down and had a look.
Back to the original post - We're getting to the point where these large-bypass high-thrust engines are becoming more like ducted-fans than traditional 'turbo-fan' engines.
It'll be interesting to see if the unducted-fan technology comes back in the next decade or so.
Likely the most prolific kinda-operational example of an un-ducted fan/prop-fan engine is the Progress D-27 on the An-70.