Tenn. Code Ann. § 29-3-104

Where such bill or petition is filed by citizens and freeholders, they shall make bond, in such sum as the judge or chancellor shall prescribe, conditioned to pay all costs and damages in the event the court trying the case shall adjudge that the proceeding was instituted without probable cause; but no bond for costs or damages shall be required where the proceeding is instituted by and upon the relation of the attorney general and reporter or a district attorney general or a county or a city attorney.