"Froths at mouth" can be portrayed in a variety of ways through synonyms. Such phrases include "foaming at the mouth" which emphasizes the rabid and violent aspect of the person's behavior. "Foaming with rage" conveys intense anger and fury in a more implicit manner. Another option is "spitting mad" which puts emphasis on the expression of anger through the physical act of spitting. "Bubbling over with excitement" can be used when the person is overjoyed or ecstatic, as opposed to angry. These synonyms help to convey the intensity of emotions and expressions that "froths at the mouth" may imply.