I call them "weebles", but not sure what their real name is. They are plastic and weighted on the bottom, so when they are knocked down, they pop up again.
I bought several of them a few years ago. Think I got them at Petco. They're really Parakeet toys and come 3 to a package, maybe with a ladder too, not sure. When I adopted Angelina from my friend, she also gave me all her toys, cages, supplies, etc. and included about a dozen of these weebles! Both Angelina and Libby, my Conure, have them in their cages, on their playstands, etc. Libby beats them up too, flings them all over the place!