Final answer:
The title for an elected official who is the chief legal officer of some counties and prosecutes misdemeanors is either County Prosecutor or District Attorney.
Step-by-step explanation:
The term for an elected official who serves as the chief legal officer of some counties and prosecutes lesser criminal offenses, primarily misdemeanors, in county courts is County Prosecutor or District Attorney depending on the jurisdiction. These officials are responsible for representing the public in legal matters within the county, providing legal advice to the county government, and prosecuting criminal cases. They play a critical role in the criminal justice system, ensuring that justice is served and the laws are upheld in their county.