Khenan
Technically you don't need the licensing for the said item.
However what you do need is at least the respected rights from the owners.
Due to the fact that you could face major legal liabilities if the creators decided to sue for the money. However if you make particular alterations in which you could simply be creating a new toy design in itself instead of basing it off of the original.
But it truly relies on what the creators want to do with the intellectual property.
Fortunately they might simply give you the rights and strike up a deal dealing with the profit.
The toys themselves cannot be altered at all. They are effectively perfect, and any toys that are made would be exactly as they were produced by the partner company. However, I would also include extra things not made in that line.
I'm sure that if they knew about this idea, (since it gives them free money and requires no input from them) they would definitely support it. It provides several benefits aside from any money they would be making with it if there were a license.
The problem is that I cannot contact them at all because they get many superfluous intellectual property requests, and can't possibly review all requests.
What do you mean by respected rights though?