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I have no idea personally, but I say "tuh-ple" because it comes from "n-tuple" (think of how you pronounce "quintuple").

What about quadru(oo)ple?

I would pronounce it with the first syllable rhyming with "stew", not "too".

I admit the distinction would be lost on anyone with an American accent anyway since "too" and "stew" rhyme in American English.

Some of the Canadian/American computer-scientists I've spoken to say it as "tuh-ple", including Stephen Cook. I count them as mathematicians.

Honestly the only person I've known to say toople is, uh, me.