Snow queens and mermaids are broadly considered water elementals in modern fantasy and folklore, though they represent different states and cultural origins of the water element.
Here is how each breaks down:
Mermaids (Liquid Water):
They are the ultimate symbols of liquid water, deeply tied to the vastness, mystery, and emotional depth of the oceans.
Their primary domain being: oceans, seas, and rivers.
Core traits: fluidity, emotional depth, storms, and tides.
Traditional elemental theory (popularized by the alchemist Paracelsus) classifies water spirits as Undines. Mermaids fit perfectly into this category as sentient, magical creatures born of and bound to the sea.
Snow Queens (Frozen Water / Ice) :
They represent frozen water, embodying the sub-element of ice, winter, and absolute cold.
Their primary domain being: glaciers, tundras, and winter skies.
Core traits: preservation, emotional detachment, and biting cold.
While classical elementals focused purely on liquid water, modern fantasy separates ice into its own sub-category. A Snow Queen acts as a specialized water elemental . . . or a dual-elemental combining water (ice) and air (blizzards and wind).

