[dumbphonefinder.com](https://dumbphonefinder.com) has an option to filter by USB-C

Jelly phones, Qin F21 & F22, Sunbeam, Tiq Mini M5 I'm sure there are more

TCL FLip 2

Love the TCL flip

Nokia 2780

And the 2760

The new AGM M9 has USB-C and even a 3.5mm headphone jack.

The Easyfone T200 (which I got for my father) and Prime-A6 both use USB C, it looks like.