I'm pretty sure the movies are more likely to mention Frodo's birth mother by name, or at least reference, more likely than his genetic father. That's my impression, because Frodo's from two prominent hobbit families, one unadventurous and respectable, the other adventurous, and I can't remember which parent was from which. So, I don't think you're being fair here and reality is the opposite of the agenda you're trying to prove. 80% sure.