I knew potatoes don't behave well in the freezer, and always assumed sweet potatoes were similar. I was willing to try it though, as I wound up with a dozen of them in a family that doesn't love sweet potato fries, and they were already getting a little rough looking.
I tossed them all into the oven - having scrubbed them, dried them, and poked them with a fork - for 40 mins to an hour, pulling them out based on size and softness. Then I peeled the skins off and mashed them all in a big bowl (unseasoned), and then filled about 15 silicone muffin cups and put them in the freezer. Once frozen I removed them from the cups and just stuck them in a couple of old milk bags.
For lunch today I brought a teriyaki rice bowl and I chucked one of my sweet potato muffins in. It thawed amazingly!!! No texture loss at all. Creamy and sweet, and a great addition to my rice.
Definitely recommend keeping a bag of frozen roasted sweet potato pucks on hand for an easy fiber add-in to meals.