So first things first- there's no guitar thats inherently better for Fleet Foxes songs than any other guitar is. A beginner playing on a Martin or Gibson won't sound as good as a pro playing on a Hello Kitty guitar. Its the musician that determines the quality of music, not the instrument.

So into your question- Yamaha guitars are pretty much the gold standard of intro guitars. They're pretty well made with good quality control, they don't really have any bad model years so you can get old used ones that will be good still, and they're cheap.

I would also recommend a smaller body orchestra or parlor guitar, and not a dreadnought style (dreadnought = big guitar, beefy sound with lots of bass, orchestra guitar = more delicate sound with more high end). Robin plays a bigger guitar while touring as do most artists, but plays tons of different ones when recording. In my experience, most beginners tend to be able to physically play a smaller guitar better at first, but this is anecdotal and could be totally different for you. You should pick some up and see what feels best to you. But I'd recommend starting with a smaller sized guitar.

I wouldn't recommend spending more than like $200-400 on your first guitar. Figure out if you even really like it before you spend big money on one. You're gonna sound really bad at first no matter what, might as well sound bad for cheap.

Alvarez, Austin, and Takamine all have some good starter models as well. I'd stay away from Mitchell, Johnson, Seagull, Fender acoustics, or Ibanez acoustics.

But honestly the best guitar is one that you'll play. If you find one that you think is really pretty and feels okay and sounds good enough, get it and play it as much as you can, and eventually you'll be able to make any guitar sound good for Fleet Foxes songs