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> Ethereum itself and many more that are stored on the ledger device.
Not crypto or tokens are stored on the ledger device. Only the seed phrase (i.e. your private keys) are stored on the ledger. Cryptos and tokens are stored on the blockchains.
Nothing will happen after the merge. If for some reason fork chains of the ETH network continue to live, a forked version of your tokens will exist on the forked chains, but they will likely have almost no value is the forked chain is valueless. Your tokens will stay on the main chain, and you’ll have nothing sp[ecial to do.
The merge will only affect how nodes / network validators process and validate transactions to add them on the blockchain. It will not impact users like you (other than maybe a change in transaction fees and transaction validation speed).