They are called "Scallop Fabric Scissors". Fiskers made them years ago, but have since stopped. On e-bay you can get them from China.
One company sells them here in USA - "Tooltron". However the largest they come is 7mm.
http://www.tooltron.com/scallop-fabric-shears/
I found these, the scallop cut is 1/4":
http://www.sewforless.com/item/Wunde...op_Shears/1255