It looks like something in water - algae or another green particle chocking this bit of water. I'd almost say frogspawn but they appear too small and lacking the distinctive black central colour. But I'd guess some kind of egg/sac or such in water.
Pretty close. They are the eggs of Albino Bronze Corydoras (corydoras aenus) on the front glass of the aquarium, and are about 1mm in size. The lighter green specs are algae on the aquarium glass, while the green in the background is an aquarium plant. I have a planted aquarium that I keep them in. I started out with three, and now have about a dozen. My Cherry Shrimp have exploded from six to about thirty or so.