I was in World of Disney @ Disney Springs (3/19/21) and didn't see one thing from Animal Kingdom. Is that normal ??! (since I have read numerous reviews from people who exclaim that there is stuff from every park here)

Rainforest Cafe is from Animal Kingdom I believe, and it's there.

Technically there is animal kingdom stuff in WoD because of having plush toys of specific characters that are more associated with animal kingdom. However, since it is still a business trying to make money, the more popular items from the company are sold there due to people still wanting the product and not being able to get into the parks to get them. Being as how hollywood studios and magic kingdom are the more popular parks right at the moment WoD sells more of the items from those parks vs the others.

No not all things are available from the parks at World of Disney. Merchandise that have a name of a park are usually exclusive to that park.