Google has been rumored to be working on a Foldable Pixel handset for quite some time now. Thanks to the Renowned tipster @evleaks we have some indications towards the same.
Heard from someone I trust that the foldable Pixel — codename: Passport, retail branding: unknown — will indeed launch before the end of the year. Apparently they've been working on this device for over two years, and if the P6 is any indication, it'll be worth a look.
— Ev (@evleaks) September 20, 2021
According to Evan Blass, the rumored upcoming Foldable Pixel is codenamed Passport. The device has been in making for the past two years and is now expected to launch by the end of this year.

Meanwhile, Senior Director at Display Supply Chain Consultants, David Naranjo also mentioned the Pixel Fold in a list of devices that are rumored to use LTPO OLED panels with a variable refresh rate. This too suggests that a folding Pixel might actually be in the works and might launch sooner than expected.
via - Xda-developers
Also, Read – iPadOS 15: Now with increased RAM!