I have seen 2 plants with fruits that resemble those found in the genus Datura. After making some searches, I am not able to identify the species. Some websites indicate them to be Datura metel or Datuna fastuosa. But, Datuna fastuosa is a synonym of Datura metel. In essence, they appear to be the same plant though the fruits look slightly different. Unfortunately, there was no flower on the plants when I saw them. I will leave them under Datura metel for the time being.
Here is one of them.
Here is the next one.