The Senior Director at Display Supply China Consultants David Naranjo shared a list of smartphones with their launched dates. The list also includes a Foldable smartphone by Google.
Also, the Pixel 6 series is on the line and is expected to be launch on October 19. However, Google has already provided a full and final look for the Pixel 6 series. According to the above list, it suggests that the Google Pixel Fold is expected to be launched in the Q4 of 2021, which means this foldable smartphone will also be launched in the fall with the Pixel 6 series.
There is no leaked render for the Google Pixel Fold, but we have a concept render by Mac Rumors, which makes a sense of Pixel Fold.
Also, a report from The Elec, suggests that many Chinese companies are working on foldable smartphones such as Xiaomi, Oppo, and Honor.