Same way as you would on mainnet. You would need to write the contract and deploy it on testnet.
Does any marketplace support nft minting on testnet?
Not sure, but I found a guide on deploying an NFT marketplace and minting NFTs on Mumbai testnet, could be helpful to you: https://www.quicknode.com/guides/other-chains/polygon/how-to-create-an-nft-marketplace-on-the-polygon-blockchain/
Can I seriously build a nft marketplace on polygon?
Of course, why wouldn't you be able to? Lots of NFT marketplaces support Polygon, including open sea and others.
Actually meaned polygon testnet
Yes of course. The point of testnet is for developers to test their dApps and contracts before releasing them on mainnet. So everything you can do and deploy on mainnet, you can do on testnet.
Can you give some link about it!
I sent you a guide above!
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