Dr. Karl Shuker's blog is a must read for cryptozoology enthusiasts. In this entry, he looks at legends, reports, and artifacts relating to claims of very small people in North American prehistory - or, as he puts it, "Babyfeet" as opposed to "Bigfeet."
COMMENT: I greatly respect Shuker, but he's incorrect in reporting that the one unquestionably existing "mummy" of a tiny human - the 40-cm corpse displayed for many years in Casper, WY - is an adult. He seems to be relying on a claim by the late author Frank Edwards that the skull was of an adult human. Edwards claimed "scientists" had confirmed this, but did not cite any sources or even give a name. Dr. George Gill of the U. of Wyoming examined the specimen and identified it as a microcephalic infant. (Oddly, no one seems to know where this curiosity is now.)