When you're making stock or simmering meat in water,

[no_hypocrisy]

4. You may be on to something. Googled and came up with

it's called "Scum."

I'm serious.

Here's the link: https://www.justonecookbook.com/how-to-skim-off-the-scum-and-fat-from-soups-and-stocks/#:~:text=When%20the%20soup%2Fstock%20is,continue%20to%20scoop%20the%20scum.