I’ve been HODLING BTC since 2014. I’ve claimed BTC Cash, gold, and soon Diamond. People talk about all kinds of forks, but I’m not sure they know what they are talking about.
Point blank: are there any other forked coins as of this post that I can claim? Is Bitcore one of them?
I think that Bitcore is one of them. As far as I know, you haven't missed any more forked coins. SegWit2x was cancelled. But in future we may see mire and more forks. Maybe these people are talking about forks, which are possible in future.
When Bitcoin Cash fork happened, I was really excited and tried to get it as soon as possible. But I didn't claimed my Bitcoin Gold so far, and I will not hurry to get Bitcoin Diamond. I'm just not waiting for these forks where altcoins using Bitcoin name. Offcourse, when it will be right time, I will sell these altcoins same like I did with BCH.