>>96786944
Ancient Mandalorians were a species called Taung, who are now extinct. In the good ol' EU they were definitely aliens, I don't think there are any "canon" depictions of them though.
Jango Fett specifically is 102% Human with a 2% margin of error, of course.
Guy on the left kills a giant slime monster with a barrel of salt earlier in the story. Sadly for him, he's about to get stoned because he didn't listen fast enough when the mage told him not to look.