Here is my rendered environment. I also placed a backdrop in so it looks more realsitic.

Environment.

The first thing i decided to make was the environment in which the animation is set. I will need to make a park scene. This will feature a grass field with a pond in the background (where the frogs will be). Once this is created i can build everything else into it. I started by making a square, flat shape and, using soft selection, raised and lowered the ground to make it look a bit more like a field.