Reddit reviews The First Snap-Fit Handbook 3E: Creating and Managing Attachments for Plastics Parts
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these are the normal ways to avoid undercuts with snap hooks.
Bump off tooling is also an option.
You can also use living hinges to get undercuts on parts from a straight pull tool.
Plastic Part Design for Injection Molding: An Introduction By Robert Malloy is a great intro to IM part design and gives a basic intro to snap fits.
[The First Snap Fit Handbook]
(https://www.amazon.com/First-Snap-Fit-Handbook-3E-Attachments/dp/1569905959) by Bonenburger goes into a lot more detail.
Check second hand book sites for cheaper used copies (Abebooks.com is good).
There are free design guides online (of varying quality...) which give a brief intro but are usually just a few pages so obviously don't have the detail the books above do. This guide by Bayer is OK. (pdf link).