I posted on Hor D' Oeuvre Pieces in general earlier. Here is the Hor D' Oeuvre Fork specifically. Several of these pieces can easily be confused with the Sardine Fork, but then others resemble a Strawberry or Berry Fork. Whatever they resemble, they are found in very few patterns.
Holly by Tiffany (5 3/8 inches)
Colonial by Tiffany (5 1/8 Inches)
Padova by Tiffany (4 inches)
Douvaine by Unger (5 1/4 inches)
Chantilly by Gorham
Strasbourg by Gorham