From WoWWiki

For specific information about this type of creature in the Battle for Mount Hyjal instance, see Frost Wyrm (Hyjal).

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Frost wyrms are the skeletal remains of blue dragons killed by the Scourge, and the remains of other types of dragons from the Dragonblight, converted into undead minions of the Scourge.

These creatures have the skeletal forms of a great dragon, and wicked intelligence gleams in their eyes.^{MoM 149} In ages past, venerable dragons nearing death flew to the land of Northrend to die. To this day there are entire dragon graveyards littered with massive petrified bones and skulls. When Ner’zhul, the Lich King, took control of Northrend, he used his powerful magics to raise the ancient dragon skeletons from the dead. Now the skeletal dragons radiate cold power and think of nothing other than serving their dark master.^{W3Man 42MoM 149} Now, these once-noble beasts serve Ner’zhul and seek to expand the Lich King’s rapidly growing empire.^{MoM 150}

They have no memories of their previous lives nor of the world beyond death. They are intelligent beings, quite capable of strategy, tactics, and deception, but they have no understanding of their past dragon heritage.^{MoM 150} Frost wyrms have a cold-based breath weapon that can shatter entire buildings. They are also quite fond of devouring their hapless enemies whole. Ner’zhul’s vicious frost wyrms hold the frosts of Northrend within their skeletal hearts. By inhaling a great deal of air, frost wyrms can expel blasts of freezing cold so extreme, that they pull all the moisture from the air around a building and freezes it solid.^{W3Man 42} The boneyard is the home of the frost wyrms...Frost wyrms have a crippling ability to cast their freezing breath onto enemy forces and buildings. In large numbers, frost wyrms present a truly dominating force.^{W3Man 44}

Frost Wyrms have a cold-based breath weapon that can do shattering damage to enemies both on the ground and in the air.

Warcraft III

From Frost Wyrm at Battle.net

In ages past, the ancient Dragons who were near death flew to the land of Northrend to die. To this day there are entire Dragon graveyards that are littered with massive petrified bones and skulls. When Ner'zhul the Lich King took control of Northrend, he used his powerful magics to raise the ancient Dragon skeletons from the dead. Now the skeletal Dragons radiate cold power and think of nothing other than serving their dark master. Frost Wyrms have a cold-based breath weapon that can do shattering damage to enemies both on the ground and in the air.

Notable Frost Wyrms

• Sapphiron

The undead
Scourge leadership	Lich King • Kel'Thuzad • Anub'arak • Amnennar the Coldbringer
Forsaken leadership	Sylvanas Windrunner • Varimathras
Notable undead	Teron Gorefiend
Types	Undead Forsaken • Abominations • Banshees • Bone golems • Crypt fiends • Crypt lords • Death knights • Flesh giants • Flesh titans • Frost wyrms • Fungal monsters • Gargoyles • Ghosts • Ghouls • Liches • Revenants • Shades • Skeletons • Undead beasts • Wights • Wraiths • Zombies • and many more...
Further reading	Arthas Menethil • Scourge Civil War • Category:Undead

Dragonkin
Dragonflights	Red • Blue • Green • Bronze • Black • Netherwing • Chromatic • Infinite • Plagued
Dragon Aspects	Alexstrasza • Malygos • Ysera • Nozdormu • Deathwing
Notable Dragons	Anachronos • Azuregos • Eranikus • Kalecgos • Korialstrasz • Nefarian • Onyxia • Sapphiron • Soridormi • Tyranastrasz • Tyrygosa • Vaelastrasz
Types	Dragon • Drake • Whelp • Dragonspawn • Drakonid • Drakeadon • Nether Drake • Undead • Fel Dragon • Frost Wyrm
Further reading	Draconic • Charge of the Dragonflights • Legacy of the Aspects • Sect of the Dragons • Dragons of Nightmare • Dragons category • Dragonkin category