I used frozen peaches in this recipe because I had two bags taking up space in my freezer. (theredheadbaker.com)
We had a bag of frozen peach slices we'd been holding onto — frozen fruit is a great way to thicken up a smoothie while keeping it cool at the same time. (17apart.com)
You might try it with frozen peaches which tend to be firmer than canned peaches. (mynaturalfamily.com)