here i found soem more images.. this is the dahb like swords ive seen.. also french wikibeadia has images of two "19th century madagascan sabres" under the french section on machetes that are with knuckle blows but have similar blades..
this clearly shows some sort of swords
an interesthing very thick bladed knife
http://ancientpoint.com/inf/188749-a..._mid_20th.html
this dahb type sword in the links Duccio post earlier
https://www.quaibranly.fr/fr/explore...telas/page/11/
images fo malagasy swords fomr wikipeadia i have dfound with a similar blade
https://fr.wikipedia.org/wiki/Machette#/media/Fichier:Sabre_d'abattis_MHNT_ETH_AC_MD_56_Juilen.j pg
these are pretty distinct..
im really confused why even in french informaiton is so obscure, maybe few things have survived or european weapons were preferred