Under the water, inside the stem of any sort of plant.
Fish
The tropical freshwater turtle macrochelodina rugosa lays its eggs underwater.
Yes a toad does lay eggs a toad lays eggs in long strips while a frog lays eggs in clumps. They both lay eggs in water.
Under shrubs, dead plants, Even under old houses.
They don't lay eggs on water. The egg is heavier than water and would break on the bottom of the source of water. They couldn't sit on the eggs in water.
The female lays the eggs
The female Lesser Water Bug fastens her eggs on the back of a male with glue. Other insects place eggs on plants or underneath the soil.
giant water bugs
Fish.
A platypus.
Adult jellyfish release eggs into the water.