No.
The workaround is: Move the topic, then move it back. The move menu offers to change every title.
Better is: Fix title only in OP and in last post. People will usually reply to one of the two, and generate correct titles. This produces correct titles for the big list of recent activity on the homepage.
It's a misfeature anyway that the forum supports individual post titles when the discussion is linear and not a tree.
-- Simon