Is fibroma in the mouth the same as cancer?

No: A mouth fibroma may be a benign growth that is firm and non-cancerous, and could even be one type called a "bite fibroma" caused by repeated (inadvertent) damage to the inner cheek by biting the mucosa while chewing. You can also get mouth fibromas from chewing your lip or running the same spot over a chipped tooth, for example. Fibroma is not a cancer, but a non-biopsied growth could be!