a babyboard is so called because it's smaller than the mainboard of the ecu that it's connected to (the parent that does the most work). it may also be called a daughterboard

and yes, in the case of the pectel babyboard, it's function is to de-encrypt eh run program and maps in the "chip"

pectel management - not really as in pectel made ecu's such as they have available now like t2, t6 etc. but i guess that they needed to protect their maps somehow