By Daniel Kline The fast-food chain has not embraced its secret menu the way its rival has, but you can order Frings or a BK BLT. Secret menus have become, well, not much of a secret. McDonald’s (MCD) – Get McDonald’s Corporation Report, for example, has embraced its formerly secret menu by offering some of its most popular items on its regular menu. That’s an idea Starbucks (SBUX) – Get Starbucks Corporation Report has embraced as well as the chain has moved a number of once-secret items to its regular menu. That’s a fan-friendly move as it takes something that’s being ordered anyway, gives i…