Is there a way to import PoolParty thesauri into SharePoint?

Yes, you can push taxonomies managed with the PoolParty Thesaurus Server into SharePoint Term store with PoolParty for SharePoint. The solution also allows you to re-synchronize the taxonomies when there are changes in the PoolParty project while maintaining the mapping between the Term store IDs and the concept URIs in PoolParty and to delete the term groups from Term store when you no longer need them. For more information, refer to the PoolParty for SharePoint documentation.