Why do frog eggs look like eyes?
because the membrane coating the egg is transparent in colour you can see the frog before it is born as a black dot in a greenish-transparent coating therefore you have an eye like fish egg
You see frog eggs take up to 3 weeks to hatch while toad eggs take up to 6 weeks which is almost the only difference they have. My opinion on how they look like when they hatch is that they really look the same with no insignificant markings to show that they are different from one another. You understand?
Frogs lay their eggs in large clusters so, it will look like a big ball made up of a bunch of smaller balls. The eggs will be clear, but if they are fertilized then they will be clear with a tiny black tadpole in the middle that will eventually take over the whole egg, then they'll be entirely black ( it's really the tadpole)
The reason behind this depends on what animal your looking at. If the animal only lays one or two eggs, it has to be good enough parent to look after them. If it lays multiple eggs, like a frog, it lays these because many will be eaten and the chances of a frog egg becoming an adult frog is slim, only about 5 of the 200 eggs the female lays will make it adult life.