"innumerable tiny" is a correct and usable phrase in written English.
You can use it when you want to refer to a large amount of something that is small or insignificant. For example: "The beach was covered with innumerable tiny shells."
Then there's Stewart Island, a birdwatcher's delight (it's home to more than 100 species) with innumerable tiny bays that are best explored by boat.
This fungus, which earned its common name because its texture is reminiscent of white-meat chicken when cooked, is a member of the polypores - a large group of fungi that produces bracket or shelf-shaped mushrooms with innumerable tiny pores on their undersides for sporing.
The instrument catches "the voice of a porpoise using echolocation to feel its way through the depths; the hiss of strong currents stirring sand along the bottom; the innumerable tiny crackles and snaps that rise from hordes of crab, shrimp, bivalves and unnamable bottom-crawling creatures; the rapid pulsing of a distant ship's propeller".
Characteristic HRCT findings consist of multiple innumerable tiny sand-like calcified micronodules that tendency toward confluence throughout both lungs.
Biot's material consists of a combination of a deformable solid and a fluid, the solid constituting a porous skeleton whose innumerable tiny cavities are interconnected and filled with the fluid.
HRCT shows a miliary pattern of innumerable tiny nodular densities in both lungs.
He made innumerable watercolours on a tiny scale, compressing astonishing amounts of topographical and atmospheric detail into them, and the sketchbooks he took with him on tours usually function in the same way.
Minor movements really matter: while aiming, you can lean to either side to acquire sightlines while minimising exposure, a tiny edge that provides innumerable kills.
The release ends a lengthy ordeal and drama over the fate of the Lebanese troops that has shaken the tiny Mediterranean country, after innumerable spillovers from the civil war in neighbouring Syria.
Molten lava proved to hold tiny mineral grains that acted like innumerable compasses, or miniature magnets, freely aligning themselves with the contemporary field.
There are innumerable lakes.
