At level 15 your better off going around the Labyrinth.
My level 22 stealth archer probably can't handle them,at least not that many.
Those Frost Trolls are probably one of the most fearsome creatures in Skyrim.
If you absolutely have to go through there try fire scrolls or spells if you have them.
Poisons can help to negate there natural health regeneration and paralize poisons can help you get in more hits with out taking damage.
Good luck.
