I hate to rat-hole on the tiniest nit, but the term "Alligator Clip" overtook "Crocodile Clip" in about 1938... https://books.google.com/ngrams/graph?content=a

I hate to rat-hole on the tiniest nit, but the term "Alligator Clip" overtook "Crocodile Clip" in about 1938... https://books.google.com/ngrams/graph?content=alligator+clip%2Ccrocodile+clip%2Croach+clip&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Calligator%20clip%3B%2Cc0%3B.t1%3B%2Ccrocodile%20clip%3B%2Cc0%3B.t1%3B%2Croach%20clip%3B%2Cc0 https://books.google.com/ngrams/graph?content=alligator+clip... (OK, maybe it's a regional thing.)