Is the Friday prayer call (adhan) three times from the Sunnah, and did any of the four Imams say so, especially Imam Malik?

For Friday prayer, only two adhans (calls to prayer) are legislated: the adhan that existed during the time of the Prophet, peace and blessings be upon him, and the adhan instituted by Uthman, may Allah be pleased with him, when the Muslim population increased. This has remained a Sunnah to this day. As for a third adhan, it has no basis, unless what is meant by it is the Iqamah (the call immediately preceding the prayer). What is practiced in some countries, having three adhans for Jumu'ah, is an innovation (Bid'ah).