Are Zoroastrians listed in the Quran as one of the People-of-the-Book alongside Jews and Christians
Quran mentions 'Magians' -'Maajoos'- here:
إِنَّ الَّذينَ آمَنوا وَالَّذينَ هادوا وَالصّابِئينَ وَالنَّصارىٰ وَالمَجوسَ وَالَّذينَ أَشرَكوا إِنَّ اللَّهَ يَفصِلُ بَينَهُم يَومَ القِيامَةِ ۚ إِنَّ اللَّهَ عَلىٰ كُلِّ شَيءٍ شَهيدٌ
Indeed, those who have believed and those who were Jews and the Sabeans and the Christians and the Magians and the polytheists - Allah will judge between them on the Day of Resurrection. Indeed Allah is, over all things, Witness. (Quran 22:17)
This is the only ayah that makes mention of them and it doesn't call them 'People of the Book.' They are considered one of the first Monotheistic religions but we don't know if they received a scriptural revelation to be called 'People of the Book' or 'Ahl al-Kitaab.'