From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
pighead /pˈɪɡhɛd/
[coll.] Dickkopf <masc>, Querkopf <masc>, Dickschädel <masc> [ugs.] , Quadratschädel <masc> [Dt.] , sturer Bock <masc> [ugs.] , Sturschädel <masc> [Bayr.] [Ös.] [ugs.] , Stierengrind <masc> [Schw.] [ugs.]
Synonyms: mule, pig-headed guy/fellow
see: mules, pigheads, pig-headed guys/fellows, He's just so pig-headed.