[chromeos] chromeos with crostini :3

I recommend you to not buy a Chromebook for that specifically. ChromeOS sucks, both in privacy and function.

I used a MS Surface some time ago with Gnome. If you want a cheap tablet, then maybe buy an used one and slap the silverblue-main-surface-image from universal-blue.org onto it.
It has the linux-surface drivers already baked in and works ootb.
On any other distro (e.g. Fedora Workstation) you would have to fiddle with it and it may break due to the custom kernel.
Besides it being a shitty device (the model I had) and MS not being Linux-friendly, it was alright.
Sadly, the newer the devices get, the worse the Linux support also gets. But if you're only after a media consumption device, they're a good choice if you choose an used older model, e.g. from 2017-2020.

Preferably, check out the 2-in-1s from the Lenovo ThinkPad series, they're also pretty good and have excellent Linux support from what I've heard.
They should work under Linux ootb, since Lenovo isn't blocking its' usage.

Gnome is ideally suited for touchscreen use, it was a huge joy to use. You don't even need a keyboard!
It looks and functions as an ideal tablet-like UI, and even the on-screen-gestures work the same as on a trackpad.

If you want Android support, check out Waydroid. Then it really gets you the best out of both worlds, desktop and mobile.