The middle looks indonesian to me also though I would not call it a sikin. If I had to guess I would say Java though it may be Sumatra. So I guess generically I would call it a parang also Look at pg 134 in Von zonneveld, I think the chopper below it may be indonesian also
some similar ones to the middle on Artzi's site
http://www.oriental-arms.com/item.php?id=2858
http://www.oriental-arms.com/item.php?id=2609
http://www.oriental-arms.com/item.php?id=533