Yes, you can. I haven't gotten around to trying it yet, but you can sideload Mantano reader onto your Fire, and it will read epubs including those with B&N DRM.
Here's a how to for loading Mantano.
There are several other threads around that might be helpful.
https://www.mobileread.com/forums/sho...d.php?t=156983
and
https://www.mobileread.com/forums/sho...d.php?t=131997