This type of boat is called a "Shell". I'm assuming you are referring to the long craft with 4 or 8 oarsman, usually with a person called a "coxswain". When the oarsman handle one oar each, the boat is a shell, if the oarsman handle two oars each, it is a "Scull". I know I have seen 8-man (or woman) shells on tv coverage. I am not sure that the sculls are also olympic events, but I would assume they are.
shells are seen as 2, 4, or 8 oarsman
I have seen sculls as 1, 2, an I believe 4 oarsmen.