Tank Frost Resistance Gear

698 Armor
+18 Stamina
+9 Strength
+33 Frost Resistance
Equip: Increased Defense +7.
Enchant: Frost Mantle of the Dawn - Permanently adds 5 frost resistance to a shoulder slot item.

Glacial Cloak
Binds when equipped
61 Armor
+18 Stamina
+24 Frost Resistance
Enchant Cloak - Greater Resistance - Permanently enchant a cloak to give 5 to all resistances.

Icebane Breastplate
Binds when equipped
899 Armor
+24 Stamina
+12 Strength
+42 Frost Resistance
Equip: Increased Defense +8.
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

Icebane Bracers
Binds when equipped
393 Armor
+13 Stamina
+6 Strength
+24 Frost Resistance
Equip: Increased Defense +5.
Enchant Bracer - Superior Stamina - Permanently enchants bracers to give +9 Stamina.

Icebane Gauntlets
Binds when equipped
562 Armor
+18 Stamina
+9 Strength
+32 Frost Resistance
Equip: Increased Defense +5.
Enchant Gloves - Threat - Permanently enchant gloves to increase threat from all attacks and spells by 2%.

Unmelting Ice Girdle
Binds when picked up
452 Armor
+14 Agility
+14 Strength
+14 Stamina
+16 Frost Resistance
Equip: Increased Defense +8.

Icebane Leggings
Binds when picked up
787 Armor
+25 Stamina
+10 Strength
+40 Frost Resistance
Equip: Increased Defense +6.
Enchant: Ice Guard - Permanently adds 10 frost resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

Ramaladni's Icy Grasp
Binds when picked up
+15 Stamina
+25 Frost Resistance
"Inscribed on the band: Ramaladni"

Hailstone Band
Binds when picked up
+18 Stamina
+20 Frost Resistance
Equip: Increases your chance to dodge an attack by 1%.

Loatheb's Reflection
Binds when picked up
+13 Fire Resistance
+13 Nature Resistance
+13 Frost Resistance
+13 Shadow Resistance
+13 Arcane Resistance
Use: Increases resistances to all schools of magic by 40 for 20 sec. (cooldown 2 min)

The Plague Bearer
Binds when picked up
3106 Armor
59 Block
+21 Stamina
+15 Frost Resistance
Equip: Increased Defense +9.
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

Alternate Options

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Helm of Wrath
Binds when picked up
696 Armor
+40 Stamina
+17 Strength
+10 Frost Resistance
+10 Shadow Resistance
Equip: Increased Defense +11.

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Skul's Cold Embrace
Binds when picked up
617 Armor
+20 Stamina
+19 Strength
+10 Frost Resistance
Equip: Increased Defense +6.
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

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Band of Icy Depths
Binds when picked up
+19 Stamina
+20 Frost Resistance
Equip: Allows underwater breathing.

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Ring of Binding
Binds when picked up
60 Armor
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
+10 Shadow Resistance
+10 Arcane Resistance
Equip: Increased Defense +4.

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Seal of Ascension
Binds when picked up
Unique
Finger    
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
Call of Vaelastrasz (not shown)
"Draconic runes appear and disappear along the inner band."

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Smoking Heart of the Mountain
Binds when picked up
150 Armor
+7 Fire Resistance
+7 Nature Resistance
+7 Frost Resistance
+7 Shadow Resistance

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Ward of the Elements
Binds when picked up
+8 Fire Resistance
+8 Nature Resistance
+8 Frost Resistance
+8 Shadow Resistance
+8 Arcane Resistance

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Darrowshire Strongguard
Binds when picked up
2153 Armor
40 Block
+8 Spirit
+8 Stamina
+10 Nature Resistance
+10 Frost Resistance
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

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With all this gear, you should be way past 315 Frost Resist (75% Reduction). You don't need all this gear, due to many buffs & consumables that get you to max, however this should help with any tanks still curious for gear.