Manikins used for dental training are either deep into uncanny valley (creepy) territory if they try and look at all realistic, or just plain terrifying in their more abstract incarnations. A lot of this is just becuase (a) people are very good at interpreting faces and anything face-like seems possessed, (b) dental manikins have to bare their teeth so often have bizarre expressions. Anyhow, they are quite interesting, particularly the vintage metal ones which are a nastily grotty and beaten up.
Although crash test dummies are iconic, there are a variety of different types, dating back to the fifties. There are ones for different genders, age, size and more recently, weight, with fatter dummies to represent the growing trend of obesity. There are different ones for cars, trains, planes, motorbikes and even those used for pedestrian impacts. Here are a dozen interesting examples.
Manikins (the alternate spelling, mannequin, is usually used for the store window variety) which are used for medical training are extremely interesting devices with accurate and working anatomical elements. This list is larger than usual since the number of interesting items meant that we kept on looking.