Nesting Dolls or matryoshka from what I have seen online they are mainly from Russia, but many souvenir spots in Krakow, Poland have them. I was able to find one with President Bush, Clinton, Bush, Reagan, and Carter in it. I am guessing Carter was the last one since he was the peanut man and his wooden piece almost looks like a peanut.
Someone at work mentioned it to me and I figured I had to get one before I left Krakow, Poland.