Shin-Ta-Waw (ش-ت-و) has 1 word in the Fahm dictionary: shitāʾ (winter).
In the Quran, words built on this root occur 1 time in 1 verse, across 1 of the 114 suras. The first is in 106:2. The form شِتَاء (winter) accounts for all of them.
“In the Quran” counts every occurrence of that dictionary form, in any of its senses.
In the Quran
إِۦلَـٰفِهِمْ رِحْلَةَ ٱلشِّتَآءِ وَٱلصَّيْفِ
For their taming (We cause) the caravans to set forth in winter and summer.
Quran 106:2
Arabic text: Tanzil Quran Text (Uthmani 1.1), CC BY 3.0, tanzil.net. English: Marmaduke Pickthall, The Meaning of the Glorious Koran (1930), public domain, via Project Gutenberg. Counts and verse choice: Quranic Arabic Corpus morphology data (corpus.quran.com).