It's worth going to court. See examples at the bottom of this page: https://www.cotmanip.com/articles/fair-use-parody#:~:text=A%20parody%20is%20fair%20use,which%20one%20work%20imitates%20another.

The toy doesn't seem to make fun or comment on the jack Daniels brand, it's just a copy with changes.

No but they are buying it because it is related to Jack Daniels. If they want to make a toy alcohol bottle just use something completely made up... Oh wait. That's not funny so it won't sell.