Frankly, it always surprises me that people are willing to randomly run other peoples' C code! It's really quite plausible that I'm just out to steal your Bitcoin wallet.

The above are all data structures - not even functions. So we say "a pimp" or "a marl" or whatever. For precision, we might say "slam a gate on a pimp," but everyone will understand you when you say "call a function on a pimp."

Then, we refer to the comments (written in English) to see what a pimp, etc, is. Documentation is admittedly a problem, but it's not any more or less a problem than in any other language, I feel. Obviously, we could have more of it!