If your watermelons look like [1], you are a bad gardener. Mine look supermarket-ready.
And I've never heard of a feral chicken. How do they survive? And where? They are a fully domesticated species, with almost no defences. Flying 8' up to a branch is a major effort for them. My neighbor loses about half of them each year to predators, and they are kept in a coop at night.
Yeah, it's not that hard to grow good garden fruits and vegetables. Plant them at the right time in good soil, keep the weeds down (that's 95% of the job in the Midwest US), water them if it gets too dry, and watch out for pests. Do that, and your produce will be as good or better than what you can buy.
I'd like to see a feral chicken too. Maybe they exist in regions with no natural predators. If mine aren't well-protected, I lose them to foxes during the day or coons at night.