Frost giant

Frost giants are a type of highborn giantkin found in cold and northerly locales.

Description
The frost giants encountered by the Slayer's Take (including some members of Vox Machina) had dull, gray-blue skin, white eyes, and pale, whitish-blue hair (including beards). The insides of their mouths were pale blue with dark teeth. The first one they saw wore thick fur and patchwork hide armor, his helmet had metallic horns attached to it, and he carried a giant axe. Frost giants typically stand 21 feet tall.

Tal'Dorei
Groups of frost giants make their home in the Neverfields, the frozen wasteland north of the Cliffkeep Mountains. Though their people are mostly nomadic reavers led by petty jarls, they all swear fealty to High King Jorskymmar, who rules from the fortress-city of Jotunborg. The frost giants are master animal-tamers, and are known to raid human villages with remorhazes, mammoths, and even white dragons at their side.

Wildemount
Various frost giant clans are known to live amongst and within the Flotket Alps, where their presence is a major reason for Uthodurn to maintain a strong fighting force.

Despite a history of Aeorian artifacts turning frost giants into zombies in Eiselcross, there are still living frost giants in Eiselcross collecting relics of Aeor. One possible encounter with a band of frost giants shows that, like the master tamers of Tal'Dorei, these giants have a tamed frost worm.

Faith
Frost giants are among the most pious of the highborn, and most pray to the Wildmother for safety before crossing the ice fields. Some giants who have suffered near-death experiences, being trapped beneath an icy lake or being smothered by an avalanche, clandestinely join one of the cults of the Chained Oblivion, seeking solace in the inevitability of eternal cold.

Named frost giants

 * High King Jorskymmar — As of 812 PD, all frost giant jarls of the Neverfields swore fealty to him. He ruled from the fortress-city of Jotunborg.
 * Jarl Conessa Berg — Obsessed with collecting Aeorian artifacts until one of them turned her and every giant in her ice castle into a zombie.
 * Valdemar - Draugr-Jarl of Farborg
 * Ace and Gary — Nicknames given by Sam Riegel and Mary Elizabeth McGlynn to the giants that aided half of Vox Machina to defeat Rimefang.

The Icelost Years
Circa 513 PD to 528 PD, when Errevon the Rimelord invaded Tal'Dorei through a rift from the Frostfell, he did so with an army of frost giants.

Fortress of the Dead Jarl
Roughly around 635 PD, on the island of Foren in Eiselcross, Jarl Conessa Berg collected artifacts from the crashed remains of Aeor, but one unstable artifact instantly turned all the giants in her castle of ice into zombies.

and
The white dragon Rimefang destroyed a society of frost giants in order to build his lair in a mountain range in the Vesper Timberland. He enslaved two of the giants, allowing them to live in exchange for their servitude. In a cavern at the base of his mountain-lair, the ruins of the giant's city lay strewn with bodies. A giant, roughshod effigy to Rimefang was erected from the rubble. The dragon's lair was located further up the mountain, where a large, ice-coated cavern had treasure frozen into the walls.

The Mighty Nein encountered and defeated three undead frost giants around the Tombtakers' secret entrance to the ruins of Aeor.

Bells Hells encountered a pair of frost giants as they left the Flotket Alps on their way to Molaesmyr. They were able to do enough damage to fell one of them, and fled the other.