"Christmas berry" is a name used for some types of Photinia. "Red Robin" is a commonly used name for a some particular forms of Photinia x fraseri.

Wikipedia suggests that Photinias are poisonous to grazing animals.

Google only knows of Photonia as a misprint for Photinia. Photinia is Rosaceae, so that just shows that not all Rosaceae are non-toxic. Another well-known rosid with toxic leaves is "cherry laurel", ie Prunus laurocerasus.