I recall seeing them, or one very similar in FFG long ago.
I believe it was called a Pelting knife. Not as nice as the one MontanaCreekHunter has though.
Jeff
The beaver knife is actually the diametric opposite of a pelter, which has a very fine point, traditionally in triangular shape like an exacto. The majority of trappers I've associated with attending the big conventions every year use the Havalon with various blades, or increasingly, the Vickie Cinch posted above.... Heck, do a Google on "pelter" and you'll see lots of trapping suppliers selling the Vickie as the Victorinox Pelter vs Parer...