We have narrations from Ahlul Bayt (AS) that the Majoos had a prophet named Damast داماست who was killed by them, and a book called Jamast جاماست which was burnt by them. (Wasaa'il Al-Shia 5:127) .
In Majma' Al-Faa'idah by Al--Ardabeeli : Zardosht ( Zoroaster) was their prophet. (7:438).
Wassalam,