Potato Bread in the store is Chometz as is Corn Bread. Its only because that how they make it
However it doesnt have to be, they could bake them without being Chometz
Continuing to read Wikipedia on Quinoa
As a chenopod, quinoa is closely related to species such as beetroots, spinach and tumbleweeds.
Wild rice is another example of people making things Kitynot that isnt. Wild rice is a GRASS not a rice, the only thing it has in common with rice is the name and it sort of looks like rice, but its a GRASS