Apologies, I have a different concept of 'crocs'. The FJ footwear in the op of this sub-thread are what I consider crocs. Others might consider then sandals.
I agree that 'crocs' as often worn by kitchen, or even nursing/operating theatre/theater staffhave no place in golf (except perhaps clubhouse kitchen). Apols for the confusion.
The visibility of naked feet anywhere on a golf course property, bar showers, is a no-no imo! But those sandals (some call them slides over here), with socks and sans-spikes would be fine by me in a casual dress area, but I wouldn't create a fuss if they weren't.
There's little/no dress code in most of the courses I play. US courses at my price level tend to be keener on sales than rigorous dress standards.