When I saw these patches of ice, they reminded me of fossil imprints on rocks. This first one looks like the skull of some prehistoric being.
This could be a snake, perhaps a relative of Apophis, the giant serpent of Egyptian myth that the sun god, Ra must fight every evening on his journey through the Duat. Ra and the other gods must win the battle each night, or the sun will not rise the next morning.
And this may be a fish-like creature, perhaps a forerunner to the great fish that swallowed Jonah.