Yes, but I would stick to yogurts that are thicker in consistency because you'll be adding additional liquid with the pumpkin puree, and don't want your yogurts to get too runny or they'll all mix together and the toppings will sink vs. supporting the fruit and granola. For example, you can sub thick coconut yogurt, or skyr icelandic-style yogurt, but I would avoid using regular blended yogurt because of the relatively higher liquid content.