Wow, thank you all for the responses! "この小娘" seems to be the correct answer. And I'm so sorry, I probably should have posted a picture of the whole scene instead of just the dialogue bubble for context! I included below a picture of who is speaking and who he's speaking to. So, does "この小娘ミッツ" altogether mean "you immature girl!" https://imgur.com/8BB2ATj

Maybe, "この小娘　ミッツ” is written by ミッツ・マングローブ. He is a male talent, he often appears on TV, on radio, or etc. but usually wears a woman's clothes, his behavior on the media sometimes way-out, he can speak English well(from Wiki). Here is a comment about "この小娘" by him https://dot.asahi.com/wa/2018031300061.html?page=2 According to the comment, he usually says "この小娘" because of being driven by his jealousy, but he added that he felt some girls are honorable. "この小娘” is really insulting. Generally, we use "この" for things, but he used "この" for girls, in other words, he treated girls as a thing. We mustn't use "このじじい", "このババア", "この若造", "この小娘", "この青二才", "この人", "この女", "この男", "このやろう", or etc. in a normal situation except for in when we really got angry with a person.

"小娘" literally means "immature girl". Elderly people sometimes disparagingly call an impudent young woman that way. / One of its synonyms is "青二才", which is used for a young man. / この小娘が！/ 青二才のくせに！

I think 「この小娘ミッツ "these *three* young girls".」 or「この小娘ミツツ(見つつ) "*while I'm looking * this young girl".」小娘 means a little/young daughter or girl. Often used as a young girl.

Wait on a Japanese native speaker's input.