Pigtail

Judy Garland appears in The Wizard of Oz trailer with pigtails, 1939
Karen Nyberg appears with her hair in pigtails in the Unity node aboard the International Space Station, 2013

Pigtails (or twin tail or twintail) are a hairstyle of twin ponytails or braids on opposite sides of the head. Sometimes unbraided pigtails are called doggie ears or bunches, and usage of the term "pigtails" varies.