It's actually pretty simple Steve
That is not meant to sound patronizing, but in principle, you can row anything that is big enough to float you and small enough to respond to the power of the crew - singlehanded oil tankers are out....

Most dinghies designed for sailing do not row well as they are too wide relative to their length and often not so light either. The narrower and lighter the hull the better it will go. The other thing is that they do not have much inherent directional stability, so they're better with a bit of board down and more important the rudder - fixed amidships if you're rowing with both hands, though there are refinements on this and it is possible to move a boat (and assist light weather sailing), with an oar over one side. I am unable to get Watercraft's back copies to go beyond
2002 and later 'next' -
http://magazineexchange.co.uk/cw/Watercraft-2002, but the picture on the front cover of No. 133 (Jan/Feb 2019) shows exactly what I am talking about.
Quite how well a cherub will go under oar
Has to be a suck it and see
Sort of process
Chris