All reptiles have one, so they likely have feelings. The most basic emotions are fear, aggression, and pleasure. Reptiles have these feelings and express them. They avoid what they fear, attack what makes them angry, and seek out what is pleasurable. In order to like someone, the animal has to distinguish between people and clearly prefer some over others.
Chelonians do tell people apart, and they prefer some people over others.
I noticed to my surprise, that there are people my friendly snake does not like for no reason I can make out. He'll sit there for up to 15 minutes. In general, you can't potty train the animal. It will train you. Many reptiles follow a daily routine which also includes eliminating.