Barbie is known as the plastic princess so we’ll start with her. Some new ones on sale in Target. I sometimes photograph them for the doll blog. Their clothing is often molded plastic now which makes no sense for a fashion doll. The second photo is a bunch of dolls, Barbie and some Bratz at my house after getting washed and having their hair untangled.
These Triang Hornby railway station buildings are similar the one I had as a child. They are made of a hard plastic.
A much older type of plastic these Nally canisters are made of bakelite.