Rashi on Exodus 32:2/רש"י על שמות ל״ב:ב׳

1באזני נשיכם [BREAK OFF THE GOLDEN PENDANTS], WHICH ARE IN THE EARS OF YOUR WIVES — Aaron said to himself: women and children have a love for their ornaments; perhaps the matter will be delayed because they will hesitate to give their ornaments, and in the meantime Moses may arrive. They (the men), however, did not wait until the women and children made up their minds but they took the ornaments off themselves (cf. v. 3: they took off the pendants which were in their ears; there is no reference to the pendants belonging to the women) (Midrash Tanchuma, Ki Tisa 21).

2פרקו is an imperative plural derived from פרק which is used for the singular, just as בָּרְכוּ is derived from בָּרֵךְ‎ (פרקו and ברכו are both masculine imperative Piel).