It isn't introduced yet

I think you're supposed to use haben hunger instead

'hunger' should be capitalized since it's a noun

It worked for me with Hunger

I believe Leute is informal, Menschen formal..

In german, people 'have hunger' instead of are hungry.

"Mensch" = person/man, "Menschen"= people/men. There are a lot of different words for people, though, so make sure you know which "people" to use in each case.

"Der Mann hat hunger" when translated word to word would be "the man has hunger" but that is not the way it's written in English ,so we translate that to "The man is hungry"

It's similar In this case as well. I hope it makes sense now.

Yes i spoke the same "Die Menschen sind Hunger".. but as they say that, in German "A man has hunger" and not "A man is hungry". So, it should be "haben hunger" instead of 'sind hunger"