Suggested tags are useful most of the time, but if I make a typo and then reblog, then go back and fix it, Tumblr still saves that tag, which is very annoying. Even if I delete the tag from all posts with the typo, it still keeps it. Is there any way to get rid of these or some script I can download?
In my personal experience, once a misspelled tag is removed from every post, it has not shown up in the tag suggestions, except before the last removal has been saved.
Make sure that you have, indeed, removed the typo from all of your posts. The search feature is a miracle tool for doing this; combine that with the Mass Post Editor (