I made some legs by using cylinders and using the edit poly I played around with the vertexes, edges and polygons. I then bend the leg into a frog like position. I then extrude two polygons to make the arms of the frog.To create the mouth I moved vertices to fit the mouth shape of the fog and selected the polygons and deleted them. Then I selected the edges on each side of the mouth and use the bridge tool to bridge across to close the open gap.