Hyoton

Hyoton is a recurring Ice-elemental ninjutsu spell from the Final Fantasy series. In some of its appearances, it is intentionally renamed to Frost in the English release only, but retains its name "Hyoton" in other translations. Hyoton means "to release ice" in Japanese.

Final Fantasy IV
Hyoton (intentionally retranslated to Frost for the English version) is a ninjutsu spell for Edge exclusive to the Nintendo DS version. Edge uses 20 MP to unleash moderate Ice damage on all enemies. It is the final ninjutsu spell, learned at level 60.

Final Fantasy IV: The After Years
Hyoton (intentionally retranslated to Frost for the English version) returns again as a Ninjutsu spell, and can only be used by Edge and Izayoi. It functions the same way it does in Final Fantasy IV. Edge learns it at level 45, while Izayoi learns it at level 42.

Final Fantasy XI
Hyoton is a series of three ninjutsu spells: They share the common trait of dealing ice damage while lowering resistance to fire, but the particulars of each spell are different, such as recast time, cast time, and methods to obtain. Hyoton spells use the ninja tool "Tsurara", which is Japanese for "ice pillar."
 * Hyoton: Ichi
 * Hyoton: Ni
 * Hyoton: San