Land gifted >35 years ago to village panchayat for specific use as children's play - ground unused:

Under Indian law, if you have gifted a portion of your land to the panchayat for a specific purpose, such as a children's playground, it may not be possible to reclaim that land without the panchayat's consent or a legal process.
It's advisable to consult with a lawyer who specializes in property law to understand your legal options and the procedures involved in reclaiming a portion of the gifted land.

Unfortunately no. You cannot claim the land since the gift is accepted by the donee

Unused gifted land can be reclaimed by donor, says HC

Permits re-conveyance when not used for intended purpose

The Madras High Court has ruled that private lands gifted to the government for specific purposes such as establishing schools and hospitals could be reclaimed either by the donors themselves or their legal heirs if the properties had not been used for the intended purpose for long.

Pronouncing the judgment, Justices K.K. Sasidharan and P. Velmurugan directed the State to consider a request made by P. Bagyalakshmi to return 2.5 acres, at Vadakkipalayam village in Pollachi Taluk of Coimbatore district, which had been gifted by her father in 1964 for establishing a school and naming it after him.

Therefore you can file a writ petition before high court and claim reconveyance of the gift lnd which remains used for the intended purpose for long time.

I thank those who have posted prompt replies.