No, your are not victim blaming at all, even if the below poster directly go for that. At the age of 12 all girls know that they should not send naked explicit pictures to strangers.
The guy is definitely a big evil arse, but there is no possibility that a teddy bear can make a 12 year old girl take off her clothes.
I have some words above, but combined with same opinion as @brianthainess. Of course one must wonder what goes on in the head of underaged girls that do such things. It also mentioned a 14 year old girl that did the same. Do you mean that neither the school, friends nor parents have said anything about such things.
Even worse to send if you do not know who your are sending to. You should not even send to people you know, as they can later be used against you. This is things children must know at the age of 12.
No, he is definitely not, but if that is what you understand, then I can only feel sorry for you.