What is this little thing in my fern’s soil

[Plantboi]

I’m not a plant expert so I’m sure it’s something very trivial and boring but I found this little green seed/ deflated grape looking thing sitting on top of the soil of my rabbit’s foot fern, and have no idea what it is!

My guess is a rhizome that never properly formed???

 

[zigs]

Not sure but welcome to the forum

 

[treeguy]

Put it back and watch what grows. Maybe a pod from outer space...

 

[Marck]

Hello, and welcome to the Forums.

It looks like a Sedum leaf beginning to root into a new plant, perhaps Sedum x rubrotinctum.
Such succulents make attractive, easy care plants. Obviously, they are easy to propagate as well.