Yes, dark green nails have been trendy.
Based on a November 2021 report, Pinterest trends indicated a significant surge in interest in dark green nails, with searches for "dark green nails" increasing by 75% and "acrylic nails green" rising by 55%. This points to a strong trend towards dark green nail colors, at least as of late 2021, particularly for those seeking autumn nail shades. While trends can evolve, this data provides evidence of their popularity.