The ClO anion is called the hypochlorite ion. Cs is the element cesium. So CsClO is called cesium hypochlorite.
For the second compound, Th stands for the element thorium. OH is the hydroxide anion and is always -1 charged. This means that the thorium must be in the 4+ oxidation state to balance out a neutral compound. So the name of the chemical is thorium (IV) hydroxide. It should be noted that thorium is naturally radioactive.