A number of countries do: The Seychelles and also the Central African Republic.
It used to be Libya. However, the all-green standard has been replaced by the flag of the monarchy, which has green, white, black, and red.
I am pretty sure that the African loon has a green head and a white body.
The flag of which country features white, green, and black colors is the flag of Libya.
Black, yellow, green, white, blue, and red
It's green and white.
Kuwait
It is not Ireland, Ireland has green white and orange stripes.
A country whose flag has the colours green, white and red
Black, Red. Green, Yellow, White
zimbabwe
The flag of the African Union is a green flag with the dark green map of the African continent on a white sun, surrounded by a circle of 53 5-pointed gold (yellow) stars.