Coffee beans aren’t beans. There are some beans that are roasted as a substitute for coffee, like the seeds of the Kentucky coffeetree. In times of shortage, people have tried many things to replace coffee, like dandelion and chicory root. For the most part, the substitutes arent as good as the original, so people don’t stick with them. There’s a chance someone has tried to roast and brew pinto beans or whatever, but they probably taste bad.