[Gatts]

all the other answers are only for fun - to provide you with interesting story / background about each of the spirits.

The one and ultimat answer (or question?) you will need to make them (at least the first two ones - mr. Ironman and Mr. Froggy) is:

Will you work for me?

Mr. Ironman will ask you to fight mages, if you win - he works for ya.
Mr. Froggy will request food : royal snakes or venomous spiders - you need to heve them in your army and than talk to Mr. Froggy - the stack will dissapear - if not enough units were in your stack - you will se percentage of "fullness" - use this as guidance to know how much you still need to buy to make him work for you.