Taolu means "form" or "routine" in Mandarin in the same way that kata means "form" or "routine" in Japanese.
Chang Quan means "long fist". Originally, this was probably a distinct style, but came to mean a general category of Northern Chinese martial arts that includes styles like Cha Quan, Mizong Quan, and Shaolin Quan. In general, you can tell that a phrase refers to a Chinese martial arts style by the designation Quan, which translates to "Fist". Quan in this context is a shortening of Quan Fa which translates "Fist Method", and therefore refers to a style of martial arts.
Chang Quan contains many Taolu ("forms"), but also many things besides forms. I risk digression, so I will stop while I'm ahead.