To be fair, fables like this are kind of silly. I'm not familiar with many of them, but the One about a cobra providing shade for Guru Nanak as an infant or the one about Guru Gobind Singh's horse refusing to walk through tobacco fields seem more like bedtime stories for children than anything to be taken seriously. I'll take that back if these stories are found in gurbani. That is all.
God created the universe out of nothing. I would say that anything is possible