The giant robots the Gingaman employed had two modes. One was their original Starbeast form, where they where simply giant monsters, akin to Godzilla. When they needed to combine they would transform into robots and form Gingaioh.
Gingaman also had Steel Starbeasts. Turned into cyborgs by Bizella (a member of the Space Pirates Barban) GigaRhinos and GigaPhoenix where turned against the Gingamen. They broke out of that control, and joined with the Gingamen. GigaBitus, a shark like Starbeast, became a carrier for his fellow Starbeasts.