Thanks for the file to experiment with.
Here is a version - I make no claim about it except it makes me think of a Snowman's swimming pool.
I added a merge shader - merging the sharply defined cracks with more fuzzy ones (via a separate color adjust) using a PF as the
merge control. Pointed that at a surface layer with a PF as a blender so the cracks are scattered.
Modified the blue ice blending PF noise stretch. Now it is stretched x 1.95 y 0.9943 z 1.95. The y value seems to
impact the amount of blue ice dramatically. Even a thousandth change becomes very noticeable.
Fill lights set white.
Terrain - used your Fractal Terrain with .3 set as the finest detail instead of 10.
- also just for fun copied the original Fractal Terrain (fine detail 10) and fed it to the Height Field and eroded it. This eroded HF Produces
the big mountain in the background.