It depends. If ledger decide to support the new forked coin you will be able to to use it once they update the app. IF not, you would have to extract private keys from your ledger (you have to use the mnemonic phrase and third party service, which is always risky).
FYI: Both BCH and BTG were supported.
i can recieve free BTG in bittrex because i have a small amount in bittrex during the fork, i use that amount for my day trade, yes your correct mate but i would like to suggest to him do not assume the free coins all they have to do place the bitcoin in safe wallet during the for the security.