Does Klarg know the location of Cragmaw Castle?

I’m running the Lost Mines of Phandelver, and my party has managed to take Klarg captive rather than kill him – he’s currently being held in a PHandalin jail cell and they plan to interrogate him in the morning.

The thing is, it isn’t clear to me from the module if Klarg himself knows the exact location of the hideout – he’s not listed with the other Bugbear who know the location, but if the party were to manage to charm him, could he potentially reveal the location to them?