Yes but these guys are really Jewish
They may have been born Jewish but a lot of them seem like self-haters. To put tattoos on your body, especially swastika's and SS insignias along with other pagan symbols is certainly not 'Jewish'.
Rastafarians don't think they are Jewish, they believe they are descendents of their messiah Selassia, who was descended from the Christian messiah. At least this is what I understand. I have attended a number of Rasta festivals during my Reggae years and still have a large reggae collection. I don't listen to that anymore because of the avodah zara involved.