Litrojia
I’m not all the way through the MYM episodes yet so maybe I’m missing something, but “pippsqueaks” prior to this week’s episodes referred to Pipp’s fans in general rather than those particular ponies. From what I can see, the tag is currently used to refer to her fans in general. Those three fillies could probably use their own tag though.
edit: finished all of MYM and that didn’t change anything