Ducky's father plays a minimal role in the franchise, having no spoken lines and only cameo appearances.  The last sighting of (a duckbill believed to be) him was near the end of The Mysterious Island (V).

Like Ducky's mother, he appears with different colors in the dream-sequence-like scene at the end of the first movie; whereas in most of his appearances he is brownish green, in that brief shot he appears purple.

Aside from Littlefoot's grandparents, he and his mate are the only couple related to the Gang to make it to the Great Valley intact.