Sadly there isn’t a special coffee bean that produces a white coffee when roasted. Actually, white coffee is the term most commonly used to describe a coffee with milk added. The milk lightens the black coffee and creates what we call a white coffee.
However, you wouldn’t be mistaken in thinking that white coffee could refer to coffee beans themselves. There are also white coffee beans. These are beans that have been under-roasted, giving the bean a lighter colour and the brew a lighter taste than the average coffee.