What are examples of interrogative nouns?

There is no noun form called interrogative nouns.

The interrogative form is interrogative pronoun, a Word that introduces a question. Interrogative pronouns take the place of the noun(s) that are the answer to the question.
The interrogative pronouns are: who, whom, what, which, whose.

Examples:
Who is our math teacher? Mr. Lincoln is our math teacher.
To whom do I give my completed application. Give it to the manager.
Which is Tom's house? The yellow house is his.