Yes, in some cases that are models, and if not there are other (non-alien) explanations. For example the very small skeleton was a human with some mutations:
http://www.dailymail.co.uk/sciencetech/article-2313828/Is-really-human-DNA-tests-inch-skeleton-alien-looking-creature-sized-head-prove-actually-human-claim-scientists-new-documentary.html
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For example Kyshtym dwarf wasn't human. The creature was not by any means a human being. The human skull consists of six bones. The skull of that creature was made up of 4 bones. There were other differences in the skeleton structure.
https://steemit.com/ufo/@luckyman404/aleshenka-the-kyshtym-dwarf-from-the-urals-russia