Ambivalence usually refer to mixed feelings of pleasure and displeasure. Attitudinal Ambivalence probably refers to having both positive and negative attitudes towards something.
Cognitive Dissonance often discussed in relation to a mismatch between different components of attitudes such a positive attitude towards helping those in need but a contradicting behavior of not giving money to a homeless person.
Cognitive Conflict usually refers to a phenomena that happens during certain tasks such as Stroop.
There is also nice chapter about that by McGregor et al. in Harmon-Jones & Mills (1999, Cognitive Dissonance APA), with an update in the reedition Harmon-Jones (2019)