Is it possible to set another webpage/iframe as the background image for a div?

Is it possible to set another webpage/iframe as the background image for a div?
You never really hear about Mascots becoming public domain, do you?
Captain Tootsie was a hero designed with one purpose: To advertise Tootsie Rolls. No first name, possibly a last name (assuming "Tootsie" even is his real name), no known origin. He was birthed from the aether, a perfect corporate entity that would ensare kids in a life of confectionary brand worship.
These children were called the Secret Legion. As far as we know, there were only three children in there - a kid in a suit named "Fisty" (unfortunate), an overweight kid called "Fatso" (mean), and a kid dressed exactly like Captain Tootsie named "Rollo" (creepy). Together, they would help Captain Tootsie achieve his goals and become more marketable in the process.
I can't really fit this into anywhere, but at one point he teaches these kids how to use a rifle and kill a bear.
Part of why I selected him is that he has weirdly taken on a life of his own in a way you wouldn't expect from a corporate mascot who happened to fall into the public domain - I mean, you don't really see anyone using Pepsi the Pepsi-Cola Cop anywhere, but people seem more than eager to utilise Captain Tootsie. Perhaps his most notable appearance is the one he made in the comic "Savage Dragon", where he was subsequently treated with a little bit too much reverence for a mascot.