this artist's pixiv tags it ぎじにょた
not sure if they're tagging with their name or what they're calling chopper or what
i just can't read moon runes
someone on /a/ was calling her chopperko, but that was the only instance of that i've seen
i simply call it "loli chopper"
there aren't many artists, and they really like to take down their sites at random
currently the only ones that i know that pump out a lot of loli chopper arehttp://sakurayuki14.blog62.fc2.com/