If the misspelled tag is being used in enough questions, you could ask here on meta to make the misspelled tag a synonym of the right tag, if you cannot suggest a synonym. With "enough questions," I mean a number enough of questions that users are not able to understand which of those tags is correct.
The page that describes the privilege of creating tag synonyms, reports the following text:
When should I propose a tag synonym?
Whenever you see questions being repeatedly tagged with the wrong or incorrect tag -- or multiple tags that mean the same thing -- it's a good idea to propose a tag synonym. The goal is to save manual retagging work by making the retagging automatic for common tag mistakes.