You should be able to rejoin if you have your sins absolved. I can't say this is always the case, as I'm NOT sure if you can absolve and still rejoin if you already spoke to Alvina, pissed her off, and she vanished. I'm TOLD she will return and you can rejoin, but I haven't tried this, myself.
But, if she's still around, then you DEFINITELY can rejoin.
However, don't stick around for anything besides the gifts. The Forest Hunters is the MOST BROKEN Covenant you could ever imagine. The summons and subsequent PVPs are VERY imbalanced. Get out as soon as you can! If you love PVP, Darkmoon, Dragon, or Darkwraith are the ways to go. For most benefit, I'd recommend Chaos Servant, Warriors of Sunlight, or Way of White. Those reap the best rewards and/or gameplay boosts.
If you're a REAL gamer you: seek a challenge, leave no game unfinished,
earn trophies yourself, and neither own nor plan to own Hannah Montana!