They are originals and can only be bought as a complete 15-man set from:
www.goblinforge.com or Nerostinto on Ebay:
http://cgi.ebay.co.uk/Goblin-Forge-Les- ... 7C294%3A30
This team is overall very cool.
I had some concerns about the heads as I thought they looked a bit strange on Goblin Forge's website. My worries proved wrong though. Some of them are wearing helmets, and the colours were too similar that I could pick out the details. With different colours they will look great.
The baby frogs are small, so you get 10 regular size minis, 4 baby frogs and the big frog. (I wish they could make/release 5-6 regular size minis to add to the team), but like Jelmer; you can have the baby frogs as strength 2 catchers and the rest as linemen and blitzers.
The gold painted minis on
www.goblinforge.com consist of 2 parts; torso and legs; so you can swap the parts between the 4.