There are TON NFT explorers. For example, the following explorer is linked on the official TEP-62 NFT standard page: https://explorer.tonnft.tools/ As for explorers that parse on-chain data, I don't know of any. There are many ways to store data on-chain, but URLs are the most prevalent. Would be a cool project for anyone willing to try it!

There are TON NFT explorers, yes. For example, the following explorer is linked on the official TEP-62 NFT standard page: https://explorer.tonnft.tools/