Ok so I tried something similar today during work.
Pretty much most marine birds who mainly have fish in their diet taste pretty similar.
I tried a number of auk species (those include things like puffins, little auks, guillemots, razorbills ect.) And when boiled they both smell and taste kind of like wet Catfood and have dark meat.
Pretty gross and not reccomedable.
I could imagine its fair to assume penguin meat will not taste much different, though I can't give first hand accounts.
BUT i live in a place where people used to hunt and eat young gulls and they supposedly tasted good ( biggest lie ive ever heard).
I think with most of these marine bird species you really only eat them when you NEED to or go through a longer process of trying to get rid of the fishy taste by keeping them in milk baths or vinegar.
