4 Pics 1 Word Puzzles

What is the 1 word (5 letters) answer to the puzzle below? Scroll down to see the answer!

4 Pics 1 Word Answer 5 letters for green toad or frog in stagnant water, green bacteria in microscope, moss on twig in woods, scum on pond with bubbles

Toad, Bacteria, Moss, Scum

The Answer is: