Forbidden Ritual cast with The Gitrog Monster on the field. Will the Monster's draw ability trigger each time I repeat the process (and sacrifice a land as my repeat) or will it trigger only once (Assuming at least one land was among all permanents I sacrificed)?

I believe each one will trigger independently. they're separate events, even if they occur within one spell resolving.

That's right. Each land card goes to the graveyard at a different time, so the hypnotoad triggers once for each one of them.

Excellent, works how I thought it would, thank you.