Actually, dark energy is what causes acceleration of expansion. It’s called dark because we don’t know what it is. Dark matter is just another way of saying the mass of the universe seems too large, given what we can observe. It really might be “dark”, at least to human eyes.
Although the vastness of space provides a lot of places for such forms of dark matter to reside in, the subatomic realm seems to offer far more possibilities in that the incompleteness of our system of quantum mechanics is more profound. The leading theories virtually all project new particles and extra dimensions that add to the Universe's sum of mass and gravity.
Anyway, as my comments suggest, in the contest between cosmology and particle physics to claim dark matter, my money is on particle physics.