avo pits are pretty unpalatable. lots of antioxidants though. i haven't got any avocados yet. just sprouted plants. it takes 3 years till they flower so i have some time to wait but i'm hopeful. i read that there is a good chance to get fruit from them even though they usually require the opposite type flower to pollinate. either a person is in the climate where avocados are already growing so the pollen will be available or the mild weather makes the flowers pollen receptivity overlap the release.
watemelon rind is edible too. it has a different range of nutrients. some southerners make pickles out of it.
i was just reading about apios growing along riverbanks. gerisole is another tuber food native to america that can be harvested wild where it grows.