Could an Ogryn use a regular two-handed weapon as a one handed weapon? For example, a chain axe. Besides, how do you know which melee weapons are one handed or two handed? There is no such category in the weapon list.
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Rogue Trader itself says nothing about any of your questions. Ogryns aren't even mentioned at all there. So I checked Only War.
Only War doesn't say anything about ogryns being able to use two-handed weapons one-handed, but I think it would be reasonable for the GM to allow on a case-by-case basis, given that ogryns start with Auto-Stabilized, Size (Hulking), and Unnatural Strength.
The individual weapon descriptions in Only War state "This is a one (or two) handed weapon.", but, for some reason, handedness is still not included in the weapon stats chart.