Yes, there is a pin and usually a limit to attempts. Ledger has a 3 attempt limit and then it'll reset the device. You can retrieve your funds by entering a 23

Yes, there is a pin and usually a limit to attempts. Ledger has a 3 attempt limit and then it'll reset the device. You can retrieve your funds by entering a 23 word mnemonic phrase that was generated when first setting up the ledger (and keys).