A tip from a leaker suggests Samsung is working on its own trifold device and possibly even a special edition of the Galaxy Z Flip.
https://www.digitaltrends.com/mobile/samsung-might-be-designing-a-trifold-phone-for-next-year/
https://www.digitaltrends.com/mobile/samsung-might-be-designing-a-trifold-phone-for-next-year/