This was my original question albeit long winded. While it might seem highly technical, both acorns and chestnuts come from trees in the beech family (Fagaceae) but acorns (which I believe are what you pictured at the market) come from trees in the genus Quercus while chestnuts come from trees in the genus Castanea.
So, do you call all of these nuts chestnuts in Urdu language? If not, what term do you use for the nuts that philipma1957 posted?
What
philipma has posted is Chestnut. I did some research and figure out there are three similar fruits in Urdu related to Chestnut and acorns.
Baloot - بلوط
Shah Baloot - شاہ بلوط
Juft Baloot - جفت بلوط
I have seen few videos where herbal doctors are calling Shah Baloot as Chestnut while some are calling Shah Baloot as Acorn. I think I should meet someone in person to find out the difference. Google is not helping in this case.