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Included in the sub-wiki below is a brief description of Duck Chess (not really sufficient):

https://en.wikipedia.org/wiki/List_of_chess_variants#Variant_(fairy)_pieces

Also, from Google here's a brief blurb:

Duck Chess is a chess variant invented by Dr. Tim Paulden in 2016. The game follows most regular chess rules but adds a dynamic component to the mix: a rubber duck that both players can move. Duck Chess introduces a rubber duck that acts as a blocker.

Another such blurb, again not quite sufficient:

Each player's turn has 2 steps: After moving a piece, the duck must be moved to a different and empty square. The duck does not move like a chess piece, you can move the duck to any open square on the board. There is no check or checkmate in Duck Chess! This means you can move into check, so be careful!

Here's a link Google gives from Chess.com about the rules of Duck Chess, again brief, but apparently this time sufficient:

https://support.chess.com/article/4578-what-is-duck-chess#:~:text=Each%20player%27s%20turn%20has%202,into%20check%2C%20so%20be%20careful!

This link has complete rules but you need to scroll down a while to get to them:

https://duckchess.com/

I thought about adding a Duck Chess article. I even uploaded a Duck image with the XBoard set. But the Interactive Diagram is not able to play it yet, so I deferred that plan to when I had an idea for how to adapt that.

BTW we have an article about a very similar variant, called Blue Chip Chess.