So.. my wife has been keeping some of the more unusual ducks; one with a mohawk, etc. She told me she wanted to put them across her dash but didn't want them flying around. I figured some 3M double sided tape would work, but she said there was some sort of mount specifically for these ducks. It was, therefore, my job to find them.
I figured it would be a sticky pad with a stick to push the duck down on. Me being me, I went on Amazon and searched for "butt plug for Jeep duck". If you follow the link, you will see that the first two results are, in fact, the push-in mounts for ducks. The third is a Donald Trump duck, which I found ironically amusing.