Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Freeze
FREEZE_FREEZE
Parameter: Variation
FREEZE_VAR
Parameter: Over Age
FREEZE_OVERAGE
Parameter: Age Gradient
FREEZE_AGEGRAD
Parameter: On
IN_FREEZE_ON
Parameter: Animation Time
IN_FREEZE_ATIME