Is this sentence is correct mango fruit?

No, that sentence is not correct. It's missing a verb. Here are some ways to make it correct:

* "Mango is a fruit." (This is a simple statement)

* "I love mango fruit." (This expresses a preference)

* "Is mango fruit good for you?" (This asks a question)

You can also use the word "mango" as an adjective:

* "I bought some delicious mango fruit."