Hex

Hex is a level 42 Shaman crowd control spell that transforms the target into a frog, preventing it from doing anything other than moving.

A hex wears off over time or when the caster has been slain.

Improvements

 * Voodoo Mastery (Restoration honor talent) reduces cooldown by 20 seconds.

Hex spell list
A variety of alternate forms are available through various means.

Unique to NPCs:
 * Shadowpine Hexxers have a unique spell that transforms an enemy into a chicken.
 * Chillmere Oracles have a unique spell that transforms an enemy into a murloc.
 * Naz'jar Spiritmenders have a unique spell that transforms an enemy into a crab.

Unavailable but found in game files:

Trivia

 * Hex is a basic Shaman spell in Hearthstone. The flavor text reads: "If you Hex a Murloc... it really isn't much of a change, is it?"