This build both maximizes both Frost's brute survivability and the survivability of his Snowglobes. How? Parasitic Armor(an ability that is not yet added to overframe, please imagine Parasitic Armor in place of Rebuild Shields) scales with both maximum shields and ability strength.
The end result being that casting Parasitic Armor, with nothing else affecting you, will put you at 3882 armor. With this much strength, that armor translates into Snowglobes with 51318 health per cast, before Arcane Guardian. It also gives you personally 14916 effective health, also before Arcane Guardian.
How-to/general gameplay loop:
Cast Parasitic Armor(your 2) whenever it's not active - unlike some abilities, you can disable and reactivate it rather than waiting for it to run out.
Cast Snow Globe(your 3) wherever you need it, to protect yourself or a defense target. Assuming you've used Parasitic Armor first, you can cast Snow Globe six times with your remaining 130 energy, for a total of 308K health of Snowglobes.
If you misplace a Snowglobe, cast Freeze(your 1) on it to break it.
Cast Avalanche(your 4) when near heavily-armored enemies to make them significantly more fragile.
Why this choice/other options:
Replacing Ice Wave with Parasitic Armor - Provides a raw 3004 armor, making you and your Snowglobes much tankier.
Redirection - Significantly improves the effectiveness of Parasitic Armor; the actual shield bonus is somewhat immaterial to this build.
Chilling Globe - Flex slot. Can be replaced with Freeze Force, Icy Avalanche, or forma'd to a different polarity for other options.
Fleeting Expertise - Can be replaced with Streamline to make Parasitic Armor, Chilling Globe, a hypothetical Freeze Force, and Avalanche's freeze and armor reduction, all last longer.
Arcanes - Swap if desired. Under normal use, you probably shouldn't be getting hit anyway, and thus Arcane Grace and Arcane Guardian are not, in truth, especially useful.
Tips and Tricks:
Parasitic Armor is affected by both Ability Strength and Maximum Shield Capacity, which means a Hildryn using Haven, a sentinel with Shield Charger, or allies in your squad using Power Donation or Growing Power as auras will all affect Parasitic Armor's armor bonus.
Note that Parasitic Armor is unaffected by your current shield capacity and overshields, and can be cast when entirely out of shields.