I ask because blue polars are genetic soup - an artificial fish, and if they bred, they could throw hybrids that don't conform to the balloonish and head deformities. At that point, if they come from blue polar convicts, there are a lot of genetic strands that could appear, but none of them can be species.
If the OP decides they're nanolutea, for example, they could destroy someone's breeding program for that fish if they were added to the line. We have to be careful of eyeball identifications in hybrid tanks.
So more info is needed.