What's it called when you buy a put and call with different expirations?

A synthetic stock without the same strikes is referred to as a Split-Strike Synthetic Stock.

I guess if you are determined for a name we can just go with the term Split-DTE Strangle.
 
The straddle calendar should be built from 2 straddle with different expiry, I don't know if this has a name, split dte sound appropriate
 
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