A melon about to be used in weapons testing.
A melon was a type of fruit.
In 2152, Trip Tucker described a fruit that fargans loved as being a melon, though he wasn't sure. In a sport played on Dekendi III, the fruit was tossed back and forth between four individuals until the fargans began to go after them. (ENT: "Stigma")
In 2287, Spock mistakenly referred to marshmallows as "marsh melons". (Star Trek V: The Final Frontier)
In 2375, Miles O'Brien demonstrated a TR-116 rifle on a melon. (DS9: "Field of Fire")