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Yes. But it wouldn't be an "anti black hole" or an "antimatter black hole", just a "black hole" like any other.

But as far as we know there are no "anti stars" out there that could collapse and form a black hole. We haven't observed any at least (don't ask me how we could tell an antimatter star from a regular one - but we could tell if one met a regular one).

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I haven't studied astronomy as much as I would like, so this is probably a stupid question, but is it possible that something other than star collapses caused a bunch of anti-matter in the early universe to form black holes, both explaining dark matter and answering the question of "where did all the antimatter go?"

It’s not impossible, but we’d have no way of knowing because the result would be just another black hole. What I can say with some confidence is that unless some wildly unexpected physics emerges, there’s no way antimatter only occurred in dense clumps and collapsed before it could annihilate. So could there have been a freak occurrence yielding a black hole from a dense cloud of antimatter? Unlikely, yet possible, but it would still do nothing to explain why matter ended up dominating antimatter.

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