Thanks for the replies, but I already thought of these things and they seem highly unlikely. As for the theory of Gollum not recalling his 'youth' and in this way not knowing what Bilbo is: he does recall memories of his youth, for example, when Frodo asks him the riddle about the eggses...
Quote:
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'But suddenly Gollum remembered thieving from nests long ago, and sitting under the river bank teaching his grandmother, teaching his grandmother to suck - "Eggses!" he hissed. "Eggses it is!"'
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He remembers alot after time, but still there is no sign of him knowing what Bilbo is, so I think it wasn't this theory that made it so that he didn't know Bilbo.
As for the evolutionary theory - I thought of that too, but I reckoned the ±570 years (the time of Deagol finding the Ring and Smeagol taking it from him till Bilbo comes down the lake) is far too short to create such a great change in the appearance of hobbits. Evolution goes slowly, it'll take ten thousands of years to get such differences. If you look at one of the old Romans of 2000 years ago you clearly see that (s)he's is human.
Thanks for your theories, but in my opinion it's a bit more complicated than that. Please feel free to try again with other theories.