Who are the major prophets of Hinduism?

In true Hinduism, there are no prophets. There are only avatars, who are incarnations of deities, or God himself, into lower realms of existence for special purposes. Avatars are worshipped as one of the core principles of Hinduism.

Hinduism isn't established with the structures of Abrahamic religions (Christianity, Judaism and Islam). In Hinduism, there are no claimed representatives of God who deliver God's message to the people (such as a prophet), which marks the inception of the Abrahamic religions. Hinduism does not purport to be an organized religion. It was not founded by any individual, and the sacred writings are from many unknown authors and great sages.