I'm not too sure about those. I've never heard anything, and neither have the two Scots that replied. I think bands like Wicked Tinkers, Saor Patrol, Albannach, etc. are just using African drums for a more tribal sound with their bagpipes. The only true "Celtic" drum that I know of is the bodhran, and it was only within the past hundred years that they even began using a tipper with that!