What type of figurative language is I'd catch a grenade for you throw my head on a blade for you I'd jump in front of a train for you?

The figurative language used in the phrase "I'd catch a grenade for you, throw my head on a blade for you, I'd jump in front of a train for you" employs hyperbole, which is an exaggerated statement not meant to be taken literally. This emphasizes the speaker's extreme devotion and willingness to sacrifice everything for the person they care about. The vivid imagery illustrates the depth of their love and commitment.