I have a few questions about the Yiddish "Shm... thing".

1. What is the linguistics term for a phrase
generating process such as this well-known
Yiddish one whereby a phrase is formed
consisting of a word followed by an "echo"
of itself with its original initial consonant
cluster replaced by Shm..., e.g. "Poodle shmoodle,
he's just a stupid dog")

I think (leaving aside the specific meaning
associated with this process in Yiddish)
such processes exist in other languages (e.g. Hindi).

2. In Yiddish the "rule" is the same when the word
starts with a vowel (null consonant cluster
so to speak), e.g. "Elegance, shmelegance..."

Is this the same in other languages?

3. What happens in Yiddish when the original word
itself happens to have Shm... as its initial
consonant cluster?

What happens in other languages?

Note in Yiddish something like "Shmuck, shmuck,
if I'm not looking out for myself, who will?"
while of course possible would not have the meaning
associated with the process I'm talking about.

We would be dealing with a simple repetition of
the word no different than "Wealthy, wealthy, let's
just say I'm not hurting".

In particular the rhythm would be different from
that associated with the Shm... repetition.

4. When the word starts with Sh..., either alone or
part of a consonant cluster whose second element
is not m (i.e. starts with Sh... but not with Shm...),
as far as I can sense the process (in Yiddish) is
the usual one, e.g. "Shlemiel, shmemiel..." sounds
to me perfectly possible.

What do you think?

What happens in similar cases in other languages
where this type of process exist?

And finally

5. Are there in Yiddish words starting with
a consonant cluster of the type Shml..., i.e.
a consonant cluster itself starting with Shm...
but stricly larger, i.e. are there in Yiddish words
such as Shmlip (this particular word is invented
of course)?

What happens then (if such words do exist)?

The normal "Shmlip shmip..." would sound to me
a bit awkward. Or maybe not.

What do you think?

What happens in other languages?

Thank you for any answer.