nod·dy 
(nŏdē)
(nŏdē)n. pl. nod·dies
1. A dunce or fool; a simpleton.
2. Any of several terns of the genera Anous and Procelsterna, found in tropical waters and usually having dark brown or black plumage with a white or gray head.
[Perhaps from obsolete noddy, foolish, possibly from NOD.]