Bard is a character mentioned in The Zippleback Experience. Gobber says he once saved a Zippleback's life, and for the rest of his life he was followed by it. Gobber speaks of him in the past-tense, which tells us that he is dead.
Not much is said about Bard, apart from the fact that he once saved a Zippleback's life and the latter 'returned the favor' by following Bard for the rest of its life.
After which, he passed away.