system
Given the following post, respond as if you're commenting on Reddit:
human
[The Little Mermaid] "Walking around on those - what's that word again? Oh, feet!" If feet are such a foreign concept to Ariel, what does that seagull call the things at the bottom of his legs?

Legamadoodles? 

EDIT: "Whaduya call em?", not "What's that word again?" Whoops, I floundered on the title.
gpt
He calls them feet. Sebastian also calls his feet feet. In fact, all of the intelligent creatures that have feet in the ocean call them feet. 

But do you go around discussing what body parts are called with your friends? Probably not. And probably less so if those friends were a different species than you. Ariel probably learned the word feet from her friends, but because she doesn't have them herself, she doesn't often have occasion to use the word and would forget the word.