Gronks
The Gronks, or the Presbyterians, are an alien race who send members of their species to earth to harvest energy for the machines that could save the Gronks' home planet, Nomalis.
Name
When studying the earth's past, the Gronks stumbled upon the Greek word πρεσβύτερος (presbyteros), meaning “elder," and, noting that greek and latin were still used and prevalent in human culture in the present, decided to use it when announcing themselves in order to indicate the fact that their existence in the universe stretched beyond that of humans.
Appearance and Biology
Gronks are generally considered cute by humans. They have multiple tentacles, legs, or feet.
Culture
The Gronks have a strict set of rules that they follow, involving food/consumed substances as well as physical contact. Gronks are not allowed to touch one another under normal circumstances.
Having carrots for dinner is taboo in Gronk culture.