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If a tree grows in the middle of a forest and there's no one around to see it, does it make a color?

As mentioned in my comment, yes and no.

It still absorbs certain wavelengths of light to varying degrees, so yes for that definition of color.

It is not received by any light receptors and no creature holds a color perception of the tree. So no, for the second definition of color.

Does the tree's absorbency color depend on the frequency of the actual photos that actually hit t?

If it's a totally dark forest (no lightsource, no photons at all), does the tree still make (or "have") a color?