Tadpole: amphibians (toads, frogs, salamanders and their friends and relations) start as a head and grow bodies and legs and arms and hands and toes from there. It must be done in warm water, because in warm water the water is the body. Slowly it dries up in the sun; at the same rate, the floating heads (polls) take on the characteristics of the sun and start to move across the land. I suspect the word “toad” comes from the sound a toad makes when it plops onto a doorstep of a summer evening.
Those are little black water beetles with two rear oars, and mosquitoes growing wings in the water.