Hi Tim-
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Yes, you can add a lot of external memory.? There are pros and cons.? This memory, being physically external to the Teensy (System On Chip), is going to be slower than the memory on the same die as the microcontroller.
The worst part about the external memory is that you can't use it for functions.? It is restricted to data.? So the use case for the external memory is a requirement for (volatile) storage of a lot of data.
What we need is more stack and heap, and the only way to fix that is to re-design the Teensy.? Other than that, diligent software design with conservation of memory is the only option.
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73 Greg KF5N
