Are these the EGGS of my TREE FROG???????

[flybyferns]

Hello, welcome to the forum. Your question was a good one, but those are not frog eggs Those appear to be snail eggs. Terrestrial snails usually lay many single eggs without the jelly substance, but aquatic snails lay eggs just like the ones you have pictured. You did find these under water, right?

This is certainly a very good possibility.
Was your gravel substrate new?
What kind of plants?
Any - aquarium- water plants?