A 'venomized graphic novel' is likely a graphic novel that has something to do with the concept of 'venom'. It could feature characters that are either poisoned or have some sort of toxic or dangerous quality related to venom. Maybe it has a story centered around a venom - based supervillain or a hero who has to deal with venom - related threats.
Yes, there are. For example, some superhero - themed graphic novels that feature characters like Venom from the Spider - Man universe are quite popular. These often explore the dark side of the character who is bonded with an alien symbiote that gives them venom - like powers.
Not really. In the comics, Groot has more than just 'I am Groot' to express himself. His character is developed with a broader vocabulary to fit different storylines and scenarios.