There isn't a lot to write about these two.
Volos was the god of horned animals and the flocks. From the alternate names given for him (Veles, Vels, Veleda (Celtic), and Felmac (Old Irish), he must be based in earlier Indo-European beliefs. After Christianization, he was replaced by St. Blasius (Byzantine).
Rod was a god associated with birth. He had numerous birth fairies (the Russian rozhenitsa, Slovenian rojenica, Czech sudica and Serbo-Croatian sudjenica).