"was" used for decoys the and what "is" used for decoys now.
Based on that I'd say there's some reason that Ponderosa Pine wasn't, and isn't, used for decoy making....it was more common than Sugar Pine, then and now, its cheaper than Sugar Pine and Redwood now, its cheaper than Tupelo, its cheaper than Balsa, etc. etc. etc.....which means to me that there is "some" property of the wood that makes it "not as good a choice" as the other woods.
That doesn't mean it won't work but it does mean, at least to me, that theres something about it that makes it less desirable than other woods. Might be wt., might be grain, might be a propensity to split, or rot more quickly, or some combinationof allof the above.....
I've never subscribed to using cheap stuff because you're getting started..nothing would seem more frustrating to me than to make something you really like and have it die prematurely because you used something that wasn't what you should have because it was "cheaper"....
Thats just me though and Lee is likely correct that it would be more than alright. He must know something about its properties though because he qualified his complimnent with "especially if your using a power grinder"..
Steve