Is there any way to get rid of these phantom Mastodon accounts, which get in the way of finding people? (Only the first two of these are ones I created.)

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@harrymccracken AFAIK that's the major weakness of a federated system like Mastodon. The same username may be used on each individual server, since there is no central authority to deconflict them.
You might try contacting those users directly--or the admins of those individual servers to ask that they be removed, but that is a crap shoot, especially if they're bad actors intentionally copying your presence here.
Good luck and keep us posted.

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