There was a recently updated thread on a square coin collection. I don't have near as many as that but I do have a few square-ish coins from Indian native states. They were hammered rather than struck so they are certainly not perfect squares
India-Sultans of Dehli-Mubarak 1316-1320 8gani 3.46g 14mm

Sultans of Malwa

Mewar half paisa 1810

Arcot 1751-1795 half paisa

Luavada 1892 1 Paisa

Sultans of Malwa Mahmud Shah AE falus
