It looks like this is the one:

Image

funkofusion.itch.io/funko-fusion

1. It closely copies the branding of Funko Fusion by 10:10 Games.
2. The title and account have been pulled.

Both match Leaf’s description:

[…] some person made a fan page for an existing Funko Pop video game (Funko Fusion), with links to the official site and screenshots of the game.
[…] I had removed the page and disabled the account.

news.ycombinator.com/item?id=42364033