It could be that the guys were playing a pretend game and the giraffe was part of the fantasy. Or perhaps they were defending themselves from what they thought was a threat from the giraffe, even if it was just in their imagination.
You can try searching on free stock image websites like Pixabay or Unsplash. They often have a wide range of clipart options, including baby giraffe cartoons.
I'd suggest looking on design-specific platforms such as Behance or Dribbble. Sometimes, designers share their vector sets there. Also, check out graphic design forums as people might recommend some good sources. But make sure the sources are legal and have the quality you need.
Most likely, the little giraffe itself is a main character. There could also be its mother and father giraffes, other giraffes in the herd, and perhaps some of the animals it interacts with like zebras or lions.
Since we don't have details about this particular story, the giraffe is surely a main character. There may be other supporting characters. If it's a story about a giraffe in a zoo, then the zookeeper could be another main character. Or if it's a story set in the wild, other animals like antelopes that share the same grazing area as the giraffe might be part of the main characters as they could be involved in the story's events.
The two main characters are the crocodile, which is a reptile known for its long body and sharp teeth, and the giraffe, a tall mammal with a long neck. In the 'Crocodile and Giraffe Love Story', they play the central roles.