As already mentioned by someone else, there's Tether Cabbage!
Just use an apple corer on a head of cabbage, run some poly cord through it, and hang it up for them to peck at.
It will last about a day..... depending on how many chickens are working on it.
And then it looks like this:

Just use an apple corer on a head of cabbage, run some poly cord through it, and hang it up for them to peck at.

It will last about a day..... depending on how many chickens are working on it.

And then it looks like this:
