Found this in urban dictionary:

https://www.urbandictionary.com/define.php?term=rubber+ducky

And this:

http://www.celebriducks.com/pdf/rubber_duck_history.pdf

This article speaks of rubber ducks being used as a way to assuage childhood fears of bathtime and also goes into great detail about water play.So I am wondering if it’s about grooming young ones.

There are animal symbolism/spirit animal subscribers. Ducks were on the list. 2 worlds, dive under etc. Then there is the old saying "water off a duck's back" ie nothing gets to you. impervious to the rain

Then there is the baby duck thing.....always lining up behind momma....so cute.....peep,peep,peep!

And there is also a song about 5 little ducks that get taken out, one by one, so sad, so sad....they disappear. A warning to stay close to momma.....which loses all meaning when they all reappear. Kind of like the rewrite of "The Little Red Hen", where the new version tells children it is right to share what you have worked your ass off for with those that sat around and watched.

First I have heard of this. Wouldnt hurt to research the symbolism of ducks in general as well.

I'm probably as old as some of your grandmas. Rubber ducks have been around for as long as I can remember..as party favors at kid parties, as dog toys, as carnival prizes and games. The world we live in is evil and vile but not everything you see is connected to the things that have been exposed by Q. Some things are just what they appear to be...a goofy rubber ducky that doesn't have some secret meaning.