My 2011 iPad 3rd gen.
A lightweight Linux distribution would make that thing killer for word processing and document reading. Might even allow YouTube videos to be watched again.
Any equivalent Android tablet would have custom ROMs etc. to get a bit more functionality out of it. I know it’s not a tablet, but look at the Samsung galaxy SII - the amount of community development for that is incredible to this day.
Sadly no, because while Android is based on Linux, it is so far removed that the kernel is wildly different. Some teams such as mobian, SFOS, postmarketOS, etc. have got fair dinkum Linux running on android devices though.