If this isn't frog spawn what is it?

[CalmCritic]

It's in a large can on a garden table. Too tiny to be frog spawn I guess and pretty sure it's too high up too! What could it be?

Image under review, but hopefully arriving shortly!

Unless it IS somehow tiny flying frog spawn which is be really very excited about.

It’s bubbles from the algae.

Some sort of algal growth, I think.

Oh algae bubbles. Lame. Thank you. Was secretly hoping for frogs