of course they are - a base of the proper vegan diet due to their high amount of proteins (:
Yes and no (I think it also depends on the culture). Beans are technically "fruit" since they come from plants, but they're classified as legumes (not légumes). They're considered both a veggie and a protein.
"Leur legume sont des haricots" is wrong but for the life of me I could not detect the "s" in the pronunciation? What did I miss?
You are searching for sounds which are subtle even when present which they aren't in this example. Meanwhile the difference between est/singular and sont/plural is inescapable.