The Freezeflame Galaxy is a galaxy in Super Mario Galaxy. It consists of a piece of frozen water, ice, and hot magma. It contains six Power Stars; three of them bring regular Stars, two of them being Comet Stars, and one hidden Power Star.
This hidden Power Star can be found at the "Frozen Peak of Baron Brr" - Baron Brr being the only boss in the level - where Mario has to grab the Ice Flower, and jump up the leaking pipes. Mario needs to Wall Jump onto the mountain side and grab the edge. Mario can, however, only grab the edge once he returns to normal.
The Frozen Peak of Baron Brr
Mario must defeat Baron Brr to obtain the Power Star.