To describe the action of inhaling through one's nostrils and then blowing it back out as an expression of frustration?
Or just blowing out through the nose without inhaling with the same emotion.
Would that be a snort? A huff? Or something else? I usually read the term "snorted" used in the context of laughing. Huffing, I think is when you do the same thing but breathing through your mouth, right? I don't see that word mentioned as much.
Anyways I imagine this being a behavioral tick for one of my characters when he's frustrated. Though he doesn't quite have nostrils (being an ant folk, he has spiracles that kind of function in the same way. He can do that not only through the spiracles near his snout, but also through his abdomen as well. Think: Hissing cockroach type behavior. The level of aggravation / frustration he feels dictates how many spiracles get involved and how intense this "snort" or whatever you'd describe. I've done "hiss" but I want to expand a bit more so I'm not relying on the same word all the time.
The word I'm sure is useful for more than just bug characters. I've observed it in myself. My old cat used to express frustration in a similar way through his nose.