From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
riddler /ɹˈɪdlə/
Rüttelsieb <neut> [grobes] , Schüttelsieb <neut>, Rättersieb <neut>, Rätter <masc>, Durchwurfsieb <neut>, Durchwurfgitter <neut> [agr.] [constr.]
Note: für Erde/Sand
Synonyms: shaking screen, riddle screen, riddle sieve, riddle sifter
see: shaking screens, riddle screens, riddle sieves, riddle sifters, riddlers
Note: for earth or sand