They are the sexless children of the Voodoo god BondyŤ, the unreachable. Worshipers of the Voodoo religion pray to Loa, or lesser spirits, in hopes that they will carry their prayers to BondyŤ, who is the creator of the world.
I really had nothing to go off of as far as illustrations, or descriptions. I did this drawing as a part of a challenge with another artist, and I thought when I threw down "Voodoo" as a subject he'd come up with something grotesque and cliche, so I wanted to make them completely different than what you'd think of when you hear "voodoo," but I still wanted you know what it was supposed to be related to. Voodoo dolls were actually not used in the religion until the slaves were brought over from Africa, when they discovered the white-man's innate fear of witch-craft.
I should probably mention that they're conjoined, as there was some slight confusion.