ΔE 21.6, loose: different enough that you should pick on purpose. Goblin Green is more muted, cooler than Frog Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Goblin Green is more muted, cooler than Frog Green.
The same difference applies the other way round: Frog Green is more saturated, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Frog Green on the colour wheel See Goblin Green on the colour wheel
All matches: Frog Green equivalents · Goblin Green equivalents