You can tell you the age of an advertising agency by its name. If you say, “J. Walter Thompson” you’re an old-line firm from the earliest days of advertising. If you’re a JWT or Y&R, you’re an old line firm, updated. If you’re Strawberry Frog, Mother, Naked, Anomaly or Taxi, you’re a new edge agency of today. Business names for the creative industry can be as fashionable as the good work they do.