Ice Sword is a combo ability available in Kirby: Squeak Squad. Kirby gets this by combining the Ice and Sword abilities. Alternatively, Kirby can inhale a Sword-yielding and an Ice-yielding foe simultaneously. It is similar to the regular Sword ability, but it freezes enemies, water, and lava. The Sword Scroll, ice bubble, and sword bubble is required. Kirby cannot obtain it by randomly mixing two bubbles. It turns into a normal sword underwater.
Curiously, along with the Fire Sword and Thunder Sword abilities, the flavor text says it can't be used in water; the Ice Sword actually turns into a normal sword underwater, and the use of the element itself is prevented.