Frogs differ from humans in possessing

The RBCs of the frog are nucleated and contain haemoglobin.
Mature human RBCs are biconcave and lack a nucleus.
Thyroid and parathyroid glands, paired cerebral hemispheres and a hepatic portal system are present in both frogs and humans.
(The frog additionally has a renal portal system, which humans lack, but that is not among the choices.)
Hence frogs differ from humans in possessing nucleated red blood cells.