They are small, have tails, and are brownish green.
Probably a toad.
Usually brownish-green, usually dark and filled with small life.
peppercorns look like small brownish black balls that are used for seasoning food
Key limes are very small green limes. It is a light green.
Kiwi
a small cabbage white
To get a light green color without using white, you can mix yellow and green together. Adjust the ratio of yellow to green to lighten or darken the shade. Alternatively, you can add a small amount of yellow to a dark green to create a lighter tint.
A little bit of black It depends on the green you're starting with. Try adding a touch of brown. Experiment. Small touches of a darker green, brown, black, red, russet, umber, or a darkened burnt orange may change in that direction.
You mix yellow with small amounts of black
Magnetite is a mineral that is part of the spinel group. It is considered the most magnetic mineral that naturally occurs on Earth. It is black or brownish black in color and can often be found with small pieces of iron attached to it.
A black hole because it can be small and massive and not even light can escape it.