In my world, there's a tentacled race of amphibious creatures. They evolved in water, but can also survive on land. They're roughly human sized, but they're boneless and they move around on six flexible tentacles. They use their tentacles both to carry themselves and grip any objects.
So what would be the best weapon for these creatures to use - i.e. if there was an army of them on land, what would be the default type of weapon employed?
Some details about their tentacles:
Fully extended, their tentacles can reach up to twelve foot long, but they lose all leverage at that length.
In general, the tentacles are very good at pulling, but very poor at pushing. The tentacles contract. They have muscles designed for dragging prey towards them, but not for pushing or thrusting with a blade.
Their tentacles have suckers, granting them an incredibly strong grip.
They move over land by dragging their torsos with their tentacles. If they are using all six tentacles to hold something, they become effectively immobile.
They have no fingers or digits; their tentacles are very flexible, but not very dexterous. They cannot handle any equipment that requires fine operation (so no bows).
Their bodies could be outfitted in armour, but their tentacles can't be - simply because you can't properly fit any sort of sheathing around them. In battle, it means that the tentacles could be very exposed and vulnerable.
Against unarmed prey, they'd hunt by ensnaring the prey in tentacles and squeezing the life out of them. However, as part of an army facing steel weaponry and amour, relying on that tactic would go very poorly. They'd need some sort of weapon instead.
I originally imagined that they'd wield spears to take advantage of their reach, but boneless tentacles just wouldn't be very good at thrusting a spear. In human weaponry, generally it's designed so that all of the strength comes from the elbow and shoulder, but these creatures have neither. They have a completely different bone structure from humans, so I have to imagine that their weapons would look completely different.
Assume low fantasy / medieval technology level.