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A search for "Canon Rebel" brings up no Froogle results at the top of the serps but if you search for "canon rebel" you do.
Seems kind of odd considering that a considerable amount of searches for a specific product would be capitalized.
I just checked some of my products and they appear in the results for lower and caps.
Logitech Mouse-- No Froogle logitech mouse-- Froogle
I see that now. You're referring to Froogle results on Google SERPS. It must be for testing purposes.
Try searching directly on Froogle. The results are the same for both lower and caps.
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