Indeed the number of early explosive devices is countless, their names varying in time and cultures. 'Petard' is indeed one that has/had a vast number of shapes and uses.
The type named as petard in the Castelneau castle museum appears to be of nowadays consensual attribution, for one:
https://castelnaud.omeka.net/items/show/48
Notwithstanding the example shown in post #8 is also a form of petard, this one a less vulgar and more complex type seen out there, within the door trap family.
While the type named 'pot a feu' in the same museum seems to be more the specimen first posted in this thread. The term Mortier=mortar=morteiro also fits in it:
https://castelnaud.omeka.net/items/show/47
.