Googling around I found this https://www.amazon.com/TROND-Extender-PD-Splitter-Expander/dp/B085DP9FFS and this https://www.homedepot.com/p/3-Prong-Outlet-Extender-with-2-Type-A-USB-Wall-Charger-Plug-Adapter-White-2-Pack-EA03AA0-0102/322178933 , but I'm not sure either of those is really what you're looking for. Any reason you need 3-prong?
A ground loop in my system related to everything hooked up to usb chargers which are not grounded and I figure it might help If they were grounded.
Not sure how many ports you need but Anker has some 3 pronged power strips with USB ports on them https://a.co/d/bhS5HqW
Just cause these have a third prong on it doesn’t necessarily mean the USB circuit is being grounded. If you popped the cover off of those, you’ll find the ground pin is just a pass through to the outlets.
Have you tried a usb battery pack to see if it solves your issue? I use a battery for one of my RPi out of laziness and it sounds good.
Apple’s MacBook charger plus a three prong extension cord is a solution that is grounded as you are requesting, but only one usb. Pics show connected earth ground. https://lygte-info.dk/review/USBpower%20Apple%2061W%20USB-C%20Power%20Adapter%20UK.html
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