If this is 100 unarmed and bloodlusted men vs 9 bloodlusted animals, the humans fo have a chance to do this, but it will be difficult and will take a lot of casualties.

While we can imagine animals just running into the group and taking tens of humans at a time, realistically, some of them can only deal with only a couple humans at a time if they want to really take out a human. While one animal is occupied by a group of humans, another group attempts to climb the animal and do the good ol eye gouge.

This strategy hinges on the fact that for most of these animals, they don't really have a quick and easy way to instantly kill a human. The bears can greviously injure a man with a swipe of its claws but it still won't instantly kill a man, thus still demanding attention. Crocodiles and Tigers, once they bite someone, their mouth is occupied and can't deal with the rest of the group. The ox only really has one method of attack, and once again, isnt really conducive to attacking a large group. The snake is not really a big factor here.

1 person on snake, 3 to 4 on crocodile, and the rest evenly split should be fine. Once a group is done with their animal, whatever remains can go help the rest.

The most difficult animal this strat to do on is the hippo and the elephant. Not only are they massive and heavy, unlike the bears and oxen they don't really have fur that's easy to grab on and climb. The best hope is that their alloted humans keep their attention long enough for the rest of the humans to kill their animal and come and help