I don't think so. I just call 'em backgrounds, and most people I know use the same term. That's basically what they are. There's different layers, to give a parallax effect. If you want to get technical they're just sprites that are 8 pixels by 8 pixels (unless otherwise noted) that are tiled in a certain way. I could be wrong about the name thing though, but I can't honestly tell what they would be called otherwise.
