How can I quickly earn money / experience in Pocket Frogs?
One of the easier and less involved ways to make some extra money is to keep two copies of your most expensive frog and then breed them. If you want to make a little extra, keep a habitat with lots of +happiness items and move the frogs into there for a while before you sell. While they're sitting in there getting happier, you can have another set of 8 in egg form. Rinse and repeat.
For more frog breeding tips and tricks, click here
Here is a way that I found out.
You need to take the two highest level frogs you have and breed them.
Go to Settings -> General -> Date and Time -> Set Date and Time.
Go forward two days or more.
Go back into Pocket Frogs and sell all the frogs. (They should all be matured up.)
Go back to Settings -> General -> Date and Time -> Set Date and Time and go back in time.
You should make a lot of money and experience over time.
Please note that this might affect some of your other games (such as ones where you gain energy or other things over time) in a way where the game counter becomes longer than it should be.
If you breed high level frogs with low level frogs, you get a lot of XP and if you have a lot of potions, you can sell them for lots of money. Lower level frogs supposedly hatch in less time for people who can wait. If you can't wait, I suggest that you download the free pop-up apps to get rare frogs(tribus, glass, chrome, lanterna, etc). You can also race frogs to find chrome or glass frogs(I found both) and if you get 1st place, you can take them and breed for rarer frogs(meaning more money).
To earn extra money, you need to breed any frogs you can. Then take them to the pond and eat a lot of flies - then the frogs will mature and then make them happy and finally sell them.