The Badger2040 is a RP2040 with e-ink display. Or possibly an e-ink display with a RP2040 on the back:
It has other goodies like 2Mb of flash ram, some buttons and lots of connectors such as a battery connector, stemma/qwiic socket and breakout pads for various serial connections. And USB-C for programming and serial in/out.
I've now got it running off my first found-free-in-the-street battery. This is a relatively small one compared to the 500+ mAh ones Big Clive has been finding but it is nice and flat and it has been powering another pico project of mine and showed no signs of flagging. I'll be fascinated to see how long it runs the Badger!