Classic comedy sketch. There's also a "whoop" of gorillas. It appears that some people think flange is the correct collective noun for baboons, as it subsequently appeared in a televised pub quiz in which someone, taught how to memorize general knowledge facts by Derren Brown, took part.
I read that primatologists adopted flange as well as troop for baboons, which I hope is true, I think there's plenty of scope for whimsy in language.
Sadly it seems the video of that sketch has been blocked or removed from youtube - the best I can find now is a poorly recorded audio - https://www.youtube.com/watch?v=vgxbAjmwUus