Frenzy And WhirlWind

[the Langolier]

I am sure it doesn't. I take it you are asking because you are contemplating a build that connects with frenzy then Whirlwinds through everything and repeats. Whirlwind already hits enough, even if frenzy does affect it, it is not significant. Frenzy is mainly for double swing/normal attack. Once you hit with frenzy once, you don't need to use it again until it wears off (the "swooshing" animation around your character will go away). Using double swing under its effect is just as quick.