Frog w Headphones ?!

Hey there everybody,

I'm pretty new to the game and just learned about the shops and freebies and all the crates.

So of course I opened all I had and found at once.

The last legendary (yellow) chest did evolve into a red one and gave me a frog with headphones.

I looked a lot into it and could not find it as plushy to craft or a key chain / cradle chain.

What is this and could you possibly point me to where to find it? It had something with sound in the name but could not find out more.

I play on a pve server (novice one)

(Sorry for throwaway account, I swear it is an honest question I just cant remember what mail my main had :') )