I agree with you. They definitely look like pie bald dragons. I found a good article which was written originally about piebald versus paradox snakes, but it mentions that the mutation can happen across many animals including lizards. They explained it really good in this article. Paradoxes and pie balds are not the same. They are similar but almost act like the opposite of each other.
https://www.reddit.com/r/snakes/comments/2g3wyp/paradox_vs_piebald/
The two pictures I uploaded are of my own little one that I bought labeled as piebald at my local pet supplies Plus.