Reminds me of when I was working as a mechanical engineer. We were working
with a company in Memphis, TN on a steel part that was going to be forged.
The company was Conley Frog and Switch. Not knowing rail terminology at the
time, I thought it was an unusual name.
Probably because they reminded people of a frog shape/form.
The typical scenario is for someone, unfamiliar with an item, to
compare it to something that reminds them by some characteristic(s).
The other common scenario is for someone to hear someone mention the
item in question, and not knowing the correct spelling or
pronounciation, morph the word into something that it sounded like or
that they are more familiar with.
Seems I read somewhere it is called a frog because it is something which is
lodged in the throat, i.e. "a frog in the throat". Probably a frog is just
a lump of something, be it a wedge, a hoof, or a wad of snot.
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