These palms are variable enough and develop differently, even leaf color can be green or a silver blue. I personally don't see anything "compact" about them.

Cheers, Barrie.

Did you see the short leaves of the adult? Also he says that they are not steril but that the adult produces only a couple seeds if any. They are very white also.

It looks like Butia X Jubaea or Jubaea X Butia

These palms are variable enough and develop differently, even leaf color can be green or a silver blue. I personally don't see anything "compact" about them.

This is very true. Butia's grow like weeds here. A butia grown in full sun can look like a completely different species of palm than one grown in shade.

Butia's grown in full sun will be very full & compact. Butia's grown in shade will be much tinner & leggy looking with much longer fronds.

Looks like a variety called Butia bonnetti. It's lineage supposedly traces back to a single capitata with unusual dwarfing characteristics discovered some thirty odd years ago. Some growers have gone out of their way to preserve it's special characteristics.