Hope it's okay to use Snap! on these projects.
Are there ways to enhance text to speech blocks?
Any advice always grateful.

Sure, you can use Snap! for anything. The copyright acknowledgement should read

Snap! is copyright 2010-2021 University of California, Berkeley.

(No such thing as "Berkeley University.")

What do you mean by "enhance"? These blocks just expose the Javascript speech API in browsers.

Thanks for the copyright. All done.