The best greens to feed a turtle are collard greens, mustard greens and kale.

There is no standard collective noun for the noun greens, in which case a noun that suits the situation can be used; for example a bunch of greens, a bowl of greens, an expanse of greens, etc.

Another name for these greens is called SandFire greens

Red Greens hat is a Canadian Military bush hat used from 1980's and 90's. you can get them from army surplus stores in Canada

greens are used for eating cooking