Build frogs from clay. Use colorful polymer clay, salt dough clay or gray clay that needs to be fired. Start by forming clay into a pinch pot and then turn the pot on its side. Attach two round balls for the eyes to the outside top of the pot. Form two flat pieces into webbed frog feet. Roll out a snake-like piece of clay for the tongue. Attach it to the inside of the mouth and curl it up. Finish according to the type of clay chosen, either air-dried, baked or kiln-fired. Paint and embellish as desired.
Make a holder for a pack of sticky notes with craft foam, craft sticks, green paint, glue, googly eyes, a marker and a magnet. Cut two large frog legs from green craft foam, two short front legs and an oval head. Cover four craft sticks with green paint and then let dry. Glue the four sticks in a square shape, slightly smaller than the notepad. Add the frog legs to the back of the craft sticks with glue. Stick googly eyes on the head and then add a smile with a permanent marker. Glue a magnet to the back so that the notepad can be placed on the refrigerator.
Teach the class to draw their own frogs. Hand out sheets of paper and markers. Display all the instructions, or take them through each step. Draw two circles for eyes toward the top of the page approximately 2 inches apart. Add a half-circle inside each eye to create the pupil. Start from the left side of the left eye and draw a curved line that goes to the outside of the right eye. Add three vertical lines evenly spaced from this curved line. This creates the front legs of the frog. Make webbed feet by connecting the three vertical lines with wavy lines. Draw another curved line a little lower than the first. Put two dots in between the eyes. Make legs by drawing half a heart on either side for the back legs. Customize as desired.
Show children images of the many different varieties of frogs. Frogs are more than just green: some are red, yellow or spotted. Hand out pieces of card stock. Trace the outline of a frog with a stencil. Instruct the class to glue collage material to fill in the shape. Use fabric, paper, magazine pages, buttons, rhinestones or yarn. After the frog is filled in, cover the collage with a piece of plastic wrap to mimic reptile skin.