326 Spring Yellowish Green / Yellowish Green
BrickLink: Yellowish Green
This color was introduced slowly, starting with Duplo and a collectifig cloth skirt in 2012. No other parts were available (except for non-production 3001s and some minifig arms in LotR) until 2014, for The Lego Movie sets (Unikitty!).
Oddly, this color was advertised as one of the "6 new colors!" when Friends first came out, but it has still yet to appear in Friends at all.