During the bloat stage of decomposition of matter, many gases begin to accumulate. These gases include hydrogen sulfide, carbon dioxide, methane, and nitrogen. Therefore since carbon dioxide (CO2) is one of these gases then we can say that yes, the decomposition of the once frozen animals will increase the amount of CO2 in the atmosphere.
Articular cartilage also serves to cushion the ends of long bones against impact. It does not attach tendons. Red blood cells are made in the bone marrow and the synovial membrane is made of a different type of connective tissue.
