The Collaborative International Dictionary of English v.0.48:

Kruller \Krul"ler\ (kr[u^]l"l[~e]r), n.
   See Cruller. Krummhorn

The Collaborative International Dictionary of English v.0.48:

Cruller \Crul"ler\ (kr[u^]l"l[~e]r), n. [Cf. Curl.]
   A kind of sweet cake cut in strips and curled or twisted, and
   fried crisp in boiling fat. [Also written kruller.]
   [1913 Webster]