You may want to look for abelskiver cast iron pans at a camping store such as Campers Village or Wholesale Sports .
If money is not an issue, you can find the same pan at Williams Sonoma.
Or, I have seen electric cake pop makers at London Drugs.
Whether it is takoyaki, abelskiver, paniyaram or banh kot, the idea is a thick batter which may be savory or sweet, and may be stuffed or not, cooked into a rounded shape.
There is a thread on this board about the abelskiver pans.