The name sounds a little silly, but the “ice vortex” is a real thing. It’s a phenomenon usually seen in extremely cold climates where, as the name implies, ice forms in water that rotates in a vortex. From the surface, it looks like a massive spinning circle of ice. While it’s not known for sure how these ice vortexes occur (they are pretty rare), it’s thought that they’re formed when ice gathers in the middle of a body of water.
If hit by a current, the ice slowly rotates until it forms a spinning circle of ice. While they are normally only observed in the most cold areas, in at least one instance they have appeared in the UK.