Q.Plant in Fish Pot
I have this fish pot and I would like to know what kind of plant would go in the mouth to look like water is shooting up out of the mouth.

It's not easy to give you a meaningful answer to this question, because what plant you use depends on things like the size of your pot, the amount of light where you want to put it, do you want stiff leaves or droopy leaves, etc. That being said, how about an asparagus fern? This article will tell you more: https://www.gardeningknowhow.com/ornamental/foliage/asparagus-fern/asparagus-fern-care.htm