Green coffee is the term we use for unroasted coffee, because it usually is green-ish. The color of green doesn't indicate quality, though some extra-dark green coffees might not have been dried or conditioned enough, and some pale green coffees might be old crop, or stored in hot conditions. Dry process coffees can look yellow, largely because the yellow-tinted silver skin (that comes off as chaff in roasting) still clings to the dry-process "green" bean. And it happens too with some honey-process or wet process coffees. It doesn't impact the cup. Decaf is kinda brown-green too. More info here: Green Coffee, Defined