Since the 1.14 came out, there are new berry bushes. You can find them in Taiga and Snowy Taiga and their variants. BUT you will never find them in Giant Tree Taiga biomes. And if foxes spawn there, there should be berry bushes as source of breeding them and food for them.

How to reproduce:
1. Create a buffet that is Giant Tree Taiga or some of its variants.

2. Wander around
3. (x)Notice there aren't any berry bushes