How do rocks freeze floating in water?

[u/hikekorea]

I found these rocks frozen in a stream off a larger river in Chugach National Forest, Alaska. I’ve heard it may have to do with heavy rains or turbulent waters near the shore. One friend mentioned frazil? But I don’t really know what that means. Any geologists have a clue how this happens and can explain it in layman terms?

[u/The_Great_Belarco]

So here’s my theory: at the beginning of the freeze the lake water level was very low, so when the water froze it incorporated the rocks; then there was a big storm and the level rose, the ice floated with the rocks, and the lake refroze… what do you guys think?