@krumbukt I haven't come across any. However, there is one for #beer makers:
https://mastodon.beerfactory.org
There are also a couple of instances that are *not* dedicated to food, whose domain names may suit somebody who wishes to have a username with reference to something edible in it:
• https://spooky.pizza - for linguists
• https://biscuit.town - feminist movement and queer/lgbt+
That's it, so far