Yes! Mashed bananas are generally interchangeable with canned pumpkin puree and unsweetened applesauce. This means you can try replacing the mashed banana with the same exact quantity of either of these ingredients and still get great results. This can also be a nice way to change the flavor with the seasons! However, banana generally has more sweetness than applesauce or pumpkin, so these soft zucchini cookies might not be quite as sweet.