As I understand it, the correct collective noun for number of crows is a murder. I get that. Crows at full CRRAWW sound does sound like what I imagine is someone being strangled. But here's the thing, fortunately not many of us will ever hear someone being strangled. Therefore, I suggest a new collective noun is appropriate. My suggestion is a staff meeting of crows. Many people drawing attention to themselves making a lot of unpleasant noises that amount to very little. But perhaps that's just me.