It can do what ever it wants
Yes and what you can do to see if there is any eggs under the hen is you can take a stick and lightly lift the hen up and see if there is any eggs under her!
They sit in the hen house on eggs, on the roost or in a nest.
Yes. they both do. But their eggs are very different. While the hen's eggs have a hard outside the frogs eggs are very soft. Also a hen doesn't lay nearly as many eggs as a frog. Also frogs eggs are in the water, while a hen lays them on land.
The hen will lay eggs either way, she will lay more if you have a rooster and the eggs will be fetilized
sit on the eggs
If you mean hen's eggs, unfertillised eggs are what are sold in your local supermarket. Fertillised hen's eggs you should be able to get from a local farm.
Remove the eggs. You can replace them with eggs you know are from another bird who was active with a rooster. Your broody hen won't care.
no but they would steal a hen.
Yes, only the hen sits on eggs.
A Hen needs to be mated before sitting on a clutch of eggs..
about 2 eggs.
There really is no need. The hen will turn them herself when she's laying on them. She won't let you touch them anyway when she's sitting on them.