Goober is all right for a prenatal name. When my ex and I saw the first ultrasound of our first all we could see was a frog so we called her Kermit. That disappeared immediately after she appeared. Go for Goober.
After our children were old enough came all the names they wish they'd never heard. I used to call them each Monkey Nose. They protested so I switched to Primate Proboscis.