Some great bands mentioned already here, dont think anyone's said eluvetite, they're a folk metal band with a female vocalist. Recently been listening to the pagan manifesto by elvenking and they use a lot of folk influences in their music. They're a mix of power/folk metal. Tyr uses some folk elements in their Viking metal, although they also sound quite power/symphonic metal as well. Also heidevolk are a Dutch pagan/Viking metal who are really cool. They sing mostly in Dutch or something but I think they're amazing. Oh and if u just want something cheesy and fun check out alestorm, Scottish pirate folk metal