I need help on some genetics.

HI, i have this guy who has some corns that are anery but het for everything he states.Since i am at a loss when it comes to the corn snakes and there genetic possibilities,i need your help.He states they are also het for Lava that when you breed them you can produce the Ice morph.I need to know some certain questions to ask him to find out if these are for real or if he is full of it.Yes i know i breed corn snakes but mine are simple:P .I just trust the members here to be honest with me ;) .