Frostbite is a Mage talent that gives your chill effects a chance to also freeze the target.
Functionality
Frostbite is a talent in the Mage frost tree that gives your chill effects a 5% chance per rank to also freeze your target for 5 seconds, up to a maximum of 15% at rank 3. Mage spells that have chill components include 
[Frostbolt], 
[Cone of Cold], 
[Frost Armor] and [Ice Armor], and 
[Blizzard] if talented with [Improved Blizzard].
Requirements
Frostbite requires 5 points in frost talents.
Use
Frostbite is a passive talent, and is not cast by the mage.
Rank Table
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Tips and Tricks
Frostbite is popular in frost and elementalist talent builds that use 
[Shatter]. The freeze effect grants more chances to crit via that talent. Since mobs and bosses in raid situations are often immune to freeze effects, frostbite is not as effective in those situations. It is more effective in solo PvE and PvP situations.
In PvP situations frostbite is effective at catching runners or slowing large groups, which is valuable in Warsong Gulch. Two effective ways to get a frostbite are with rank 1 [Frostbolt] and rank 1 [Improved Blizzard]. With rank 1 frostbolt, the cast time is 1 second with full [Improved Frostbolt] and 1.5 seconds untalented, allowing the mage to rifle them off quickly with the hope of landing a frostbite. With improved blizzard, each tick of the AoE applies a chill, and thus each tick has a chance to frostbite. Rank 1 is mana efficient enough to chain cast it for a frostbite hit.
The freeze effect from frostbite does not overwrite the 
[Frost Nova] effect or the Water Elemental's Freeze effect. These spells have a longer duration (8 seconds vs. 5 seconds) than frostbite, and thus supersede it. Even if the frost nova or freeze has fewer than 5 seconds remaining, frostbite will not take effect.
Frostbite is an undesirable talent in frost AoE grinding builds. The goal in a frost AoE situation is to keep a large pack of mobs grouped close together and snared with [Cone of Cold] and/or [Improved Blizzard]. If frostbite lands, it can separate a mob from the pack, complicating the kiting process.
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