The eggs in question are connected inside of one egg sac. Is this where two-headed/siamese tadpoles come from, or is there a chance they will split? Identical twins maybe? (I'm guessing not...)
You can see an artist's rendition of a three headed toad hereAnybody ever seen a three headed tadpole? My Zapps threw one, once. It only lived about a week. That would have been too cool if it had morphed out into a three headed Zaparo! Of course, then there would be the concern of getting their tongues all tangled together when hunting the same fly!