Staking with Lido you get stMATIC on the Ethereum network, however, you can also bridge them to the Polygon network via Polygon PoS bridge or Stakeall Finance.
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stMATIC is supported by a variety of DeFi applications across Ethereum and Polygon networks (Balancer, Curve, Beefy, Dystopia, Kyber, Quickswap etc.)
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stMATIC on Ethereum - 0x9ee91F9f426fA633d227f7a9b000E28b9dfd8599
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stMATIC on Polygon - 0x3A58a54C066FdC0f2D55FC9C89F0415C92eBf3C4