This is the current information as it reads on the noggin page:
The Noggin is the first monster available for purchase in the market. They can also be produced by breeding an unstable combination between a Noggin and another monster.
The part about breeding is vague and not helpful.
I should say, "Any monster that you breed with a four element monster will produce that monster, and sometimes a rare or special monster".

It does say it on other pages, but the page that the breeding info is on is usually the first place new users go to get the information they need to enhance game play. Example: secret likes, this is helpful.

This information is especially useful when trying to fill a wubox.
Well that is just my opinion.