Luscious Soogar Icington the Third

Smooth is a guy Gran Crood used to date. She mentions this in Voice Fail

Gran's ex is his alias, implying they no longer date.

Luscious Soogar Icington the Third is eventually revealed as his full name.

He is SO smooth that if he merely mentions how hungry he is, not only insects but mammals will just march into his mouth to be eaten.