There are not - TPU is literally a Google trademark:
> Tensor Processing Unit (TPU) is an AI accelerator application-specific integrated circuit (ASIC) developed by Google.
https://en.wikipedia.org/wiki/Tensor_Processing_Unit
The rest of what you're talking about is irrelevant
NPU: Neural Processing Unit: https://en.wikipedia.org/wiki/Neural_processing_unit
Coprocessor: https://en.wikipedia.org/wiki/Coprocessor
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There are not - TPU is literally a Google trademark:
> Tensor Processing Unit (TPU) is an AI accelerator application-specific integrated circuit (ASIC) developed by Google.
https://en.wikipedia.org/wiki/Tensor_Processing_Unit
The rest of what you're talking about is irrelevant