There are two different sets, the first one is the original pack of ghouls from Uncle Mike's line of Strange Aeons miniatures. I'm not sure if these are still in print.
The other batch are from RAFM's "Call of Cthulhu" line. I bought them so long ago I can't actually remember if they are ghouls or some other kind of beasties. I painted them with the same skin colours, but even so they don't really look like the same kind of creatures.
You can see what I mean when they're all together. The dude with the book could stand in with the UMW figures in a pinch. They're fine miniatures all 'round and will get some time on the table soon. I didn't spend a ton of time on them, but I'm pleased with them nonetheless.