Short answer: Yes, coconut (fresh or dry/khopra) is generally permitted during Paryushan.

Important nuances:

• If you have taken the “boiled water only” vow, do not drink coconut water, because it is unboiled.
• Follow your sangh’s maryada: some groups keep food very simple (no fried/rich sweets), so coconut-based sweets may be avoided even though coconut itself is allowed.
• Usual Paryushan restrictions still apply (e.g., no root vegetables; use boiled, filtered water; eat simple, saatvik food; nothing after sunset as per your vow).

If you follow a stricter vrat (e.g., only boiled food or only ekasana/ayambil), take coconut only in forms that align with that specific vow.