Snake turned to crocodile?

a snake was going away, it took a u turn while i called out to show it to dad.it turned into a crocodile as it came near.it was trying to eat me, but was afraid of dad.i was relieved that it was trying to eat me.i thought " finally! everything will be over in another 2 minutes if i keep quiet". dad did not allow it to eat me. and the crocodile stayed under my bed. weird dream! but what does the whole thing mean?