Albino Namekians are an extinct Namekian race that lived on Namek with the other green population until Super Kami Guru blamed the great drought on them and they were promptly wiped out in a genocidal purge by the green Namekians.
Not much is known about their appearance, but because they are albino and since Super Kami Guru thought Krillin was an albino Namekian, it's very likely that they are light skinned. They may also have height and body structure similar to the green Namekians.
After Super Kami Guru drank all the water on Planet Namek and caused the great drought, he blamed it on the Albino Namekians and the infuriated Namekians killed them all, as per Super Kami Guru's instruction.
During the Namek Saga, the Albino Namekians were referenced a few times, the first one was when Super Kami Guru saw Krillin and thought he was one, the second was when Porunga was summoned and also thought Krillin was an albino Namekian.
When Super Kami Guru thought he was dying he revealed that he caused the great drought and blamed it on the Albino Namekians the green Namekians grew mad with guilt and killed and devoured Guru.
- It's possible that Porunga was summoned to kill all the Albino Namekians, thus explaining how he knew about the purge, but one villager said "we slaughtered thousands", so the exact way they were killed is unknown.