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The chocolate frog cards were hidden throughout the various moments across all seven books. A bar at the bottom of each moment showed how much progress you had made, if it was full there was nothing left to find. In September 2015, Pottermore was redesigned and relaunched. The original concept of following and interacting with the story changed. You no longer collect chocolate frog cards.
A complete list is unknown, but you can find a list of the known chocolate frog cards in related links.
As far as I know, the four house creators and (most likely) Dumbledore. (It is the 4 founders and Dumbledore. I got his card today from the park.)
It's for the pottermore store and it is locked to all at the moment. It will open for ebooks and such in October.
Pottermore was originally opened to 1 million beta testers. The site officially opened to all in April 2012.
There was no separate website for Pottermore beta testing. To access it you had to successfully complete the Magic Quill Challenge. The site is now open to all.
Frogs? None, he's eaten them all. But the cards, he has all but two, Cornellius Agrippa and...someone else. That means he has approximantely 48 cards (not incluiding duplicates)
No, background information is provided for some characters. Not all.
Try Pottermore. I am on it because I got early entry and it is fantastic. It should be open to all in the New Year but dont quote me on that.
You had to take part in the Magical Quill challenge. It ended on the 6th of August 2011. Pottermore officially opened to all on 14th April 2012.
It would be unfair to know the next Pottermore clue before it was released. You can find a list of all the clues and answers on the link to the Pottemore Insider in related links.
Sometimes it gets sick and needs to be taken to the vet and it usually coughs the frog up because the cat get less comforted with a frog hopping around in its throat.