Yes, I grow all kinds of stuff for my flock! Here's a partial listing, since I'm bound to forget something and may find something else new to feed them tomorrow:
Azolla (a floating water fern--duckweed is good too)
all kinds of garden greens
bananas
cassava (cooked)
mangels (aka fodder beets)
coconut meat
soldier grubs
random overripe or surplus orchard fruit
and to a lesser degree mostly:
pidgeon peas
comfrey
breadfruit (cooked)
taro (cooked)
sweetpotato (cooked)
squash of various kinds (usually cooked)
sometimes the offal or scraps leftover from making stock from the animals we raise for food
and also not grown on our property for chicken feed per se but byproducts or things acquired for free that are fed occasionally:
loaf ends or crushed or moldy bread products from a local deli
freezer burnt tomatoes, overripe fruit, expired food or other tidbits from local grocery
random kitchen scraps from our household
Approximately 2/3 of what they eat comes from home-grown or salvaged sources (the rest is OG layer pellets usually, sometimes chick starter, which is higher in protein). I supply oyster shell free-choice on the side. The only major difficulty I have found is being able to supply them with enough regular protein this way, although it's certainly possible, especially if you are able to free range with plenty of insect habitat around (I am not). Having access to meat scraps or offal or to a dairy would be grand too.
You might be interested in perusing the many great contributions to this thread I started sometime ago:
https://www.backyardchickens.com/t/615228/home-feeding-ideas-and-solutions-discussion-thread
Cheers,
Sky