Like most foods, not all frozen yoghurt bark is created equally. It will all depend on the yoghurt used and the toppings/stir-ins that you choose to add. If your bark is made from an added sugar yogurt with toppings such as candy, chocolate etc then obviously it is not a healthy treat. If, however, you use plain yoghurt, avoid too much sweetener and add healthy toppings, such as fruit and nuts, then you have yourself a healthy snack.