Has fh made a single-player omaha map? If so, can someone put up a link to where I might download it?
No. There is no Omaha map at this point. I think some chinese guy once made one, but the only thing you can still find about it are some laggy YT vids. All the links are down, you can only find a chinese page to download it. And that requires a chinese Dloader tool to be installed first. Btw this link also seems to be dead.
Anyway, there are few more coop playable beach maps you can try out.
They're called "bloody beach" and "longues sur mer"
filenames: "skrimish_bloody_beach" and "Longues_sur_mer"
You should be able to find them.
If needed/wanted, I can upload my slightly edited versions of them. The maps were once made for some tournament, so the Loadscreens aren't that nice and for example specific command posts can't be captured. They were also made for an older version of fh2, I think. I added FH-Style loadscreens, changed the sides a little I think and made all CPs (instead of critical bases) capturable. So if you'd like to have this, just give the call and I'll upload them. Note again: I only added COOp support.