Can I add a Google Coral Accelerator into Jetson Nano's slot?

Just curious if it’s possible to a Coral Mini as a slave. Which interface does Jetson Nano expose, by the way? There seems to be a lot of variants.

https://www.sparkfun.com/products/15886
https://www.sparkfun.com/products/15887
https://www.sparkfun.com/products/15888

Both the pci and usb versions work:
https://devtalk.nvidia.com/default/topic/1068260/jetson-nano/m-2-pcie-google-coral-in-ubuntu-/

I think the second of your links is the right one for nano, but you should double check with the nano spec sheet.

Cool, I have found a datasheet provided by Sparkfun:

https://cdn.sparkfun.com/assets/0/7/f/9/d/jetson-nano-devkit-datasheet-updates-us-v3.pdf

It says “M.2 Key E” under the I/O section, and I assume it corresponds to “Coral M.2 Accelerator A+E Key”?

Yes, that should be the one. I just double-checked and the specs on Nano say key E.