This is a picture of a healthy tegu stool. Unlike monitors they have a firmer stool.
The yellow is the urates, these can also be whitish in color as well, and the brown is feces. The two white strings are the sperm plugs. These can also be very stringy and are often confused with parasitic worms. I have many people contacting me each spring thinking that their tegu has worms, and I wanted to share this with everyone. Also note, the sperm plugs are only found in adult male tegus feces.
This is just a closer look at the plugs.