* Trooper: This is a common word, often referring to a member of a mounted police force, a soldier, or a person who shows courage and resilience in the face of adversity.
Example: "The state trooper pulled over the speeding car."
* Troupe: This word refers to a group of performers, especially actors, dancers, or singers.
Example: "The circus troupe arrived in town."
If you can provide more context about where you saw the word "tropper," I might be able to help you figure out what it actually meant.