Thought you might be interested in a few definitions of Pollywog:

1) The name tadpole is from Middle English taddepol, made up of the elements tadde, 'toad', and pol, 'head' (modern English poll). Similarly, pollywog / polliwog is from Middle English polwygle, made up of the same pol, 'head', and wiglen, 'to wiggle'.

2) What is a Pollywog astronomy?

Tadpole galaxies are rare and difficult to find in the local universe. ... The galaxy is a member of a class of galaxies called “tadpoles” because of their bright heads and elongated tails. This galaxy resides relatively nearby, at a distance of 80 million light-years.

3) The ceremony observes a mariner's transformation from slimy Pollywog, a seaman who hasn't crossed the equator, to trusty Shellback, also called a Son or Daughter of Neptune. It was a way for sailors to be tested for their seaworthiness.

Just in case you were interested! Say Hi to Pollywog for me!