I mean, youtube, sure (though more the mindshare than the product itself), but what's left of the Android that was acquired? They didn't even have a product at the time so everything they ever released was as part of Google. And Ad Words wasn't an acquisition.

After some amount of time, for most acquisitions this argument becomes silly.

Apple acquired NeXT and PA Semi. And I hear Jony Ive was hired, not grown in a vat in Cupertino. Apple didn't build its hardware, software, or design in house!