Thanks for the heads up from Jazzcat – Twin Ranger was a game that was mentioned in Danish Magazine IC RUN Nov/Dec 1988.
It was briefly mentioned as being developed, from a newsletter from Starvision’s owner Ivan Sølvason.
Shortly after the finding, it seems only an Amiga edition was in the planning stages. The game had 3D effects and other features which seemed to sound like a 16-bit title. Even that is missing though, so the details have been forwarded onto the Amiga GTW team.