user #1254630, the user who created "anklehighs" (forum #331043), has chosen a new tag to misuse. They've applied short socks to a lot of posts that don't exactly fit the tag name.
This tag has no wiki page so I'm not sure what exactly it's meant to be for, but its certainly not for things that already fall under ankle socks. It also isn't on the reference chart cited in other sock-related wiki pages. Its current usage seems to fall under existing tags anyways so I'm not sure what purpose it serves. It's not an entirely new tag so I'm hesitant to request an alias right away without looking into it more, but this behavior is becoming a pattern.