Logan the Great's page

So with all these bomb discoveries, I gotta ask. Can discoveries be used at the same time? Can I make an explosive, frost, inferno bomb?

It seems like every other appendage is covered. Legs, arms, tails, tentacles, wings...but nothing is mentioned about heads. Not going to lie, my desire for this is 90% cosmetic for a Cerberus look, but I could see it also being used to give extra bite attacks. So would it be 1 or 2 evo points?

Thoughts, feeling, opinions?