Some metal roofs are made to look like shingles, but usually in the form of a long strip of metal that is imprinted with a shingle-like pattern to give the illusion of shingles.
A bit like this, if you look closely you'll see it's long strips of metal running laterally with a shingle pattern. From a distance it looks almost like any other shingled roof.
Semi-related but I recently went to New Mexico and saw a ton of people with roofs made of what looked like corrugated steel/composite. Never seen it before, my friend said it's because it's really effective against hail. Must be loud as hell when it rains or hails!