No. Frogs are amphibians, while monotremes are a sub-group of mammals. There are just three species of monotreme: the platypus, the short-beaked echidna and the long-beaked echidna.
It depends on the type of frog. Some frogs, like the southern brown tree frog, love and most of the time live with other frogs. While some frogs are so territorial that they will fight to the death.
That depends on the species, most frogs in tropic parts of the world will develop from egg tot adult in a year, other frogs may live years as a larva and when they become a small frog (juvenile) it...