Create a new formula field:

if (not(isNull({CnBio_Anonymous})) and {CnBio_Anonymous} = TRUE)
or (not(isNull({CnGf_1_Anonymous})) and {CnGf_1_Anonymous} = TRUE)
then "Anonymous Donor"
else {CnBio_Name}

Delete the {CnBio_Name} field from the report design and insert the new formula field.