Check the small print in the brochure. A few operators include gratuities, a lot (US ships) add 15% to bar bills and add a statutory amount per passenger to the final onboard account (you can opt out if you prefer) and some just leave it to your conscience! As far as I know the only ships where you don't tip are Hurtigruten, which are essentailly working cargo ships with passengers.
The general answer is no. When tips are expected, requested or obligatory then they are either added on to you initial payment or you pay them on the ship but they are not in the quoted cruise price unless it states so. I hope that's not too complicated to understand. .......Neil.
No, not normally. They are added to your final bill. Remenber these are esentially the crews wages!