The last outright fraud or hoax I can think of relating in any way to evolutionary theory was that fossil bird that was composed from the body of one creature and the tail of another. (Both being valid fossils individually.) That was, what, five or six years ago? Even that wasn't a nefarious evilutionist plot, but just some Chinese fossil merchant trying to make a few extra bucks. I don't know of any frauds or hoaxes touching on human evolution other than Piltdown.
Funny thing is, compared to most other scientific fields, evolutionary biology seems to have an unusually low rate of fraud and deception, as illustrated by the ancient dates of the examples that anti-evolutionists are able to dig up.
But then maybe this is explicable. Whatever the perceived "glamor" of the field, there isn't really much money involved in evolutionary biology, and fraud is usually about money in the end. Far and away the greatest number of frauds occur in biomedical science, and this is also where the most money is.