Q.Avocado tree
The leaves on my avocado tree have all shriveled up the stock is still green will it grow new leaves
You will want to determine why your tree's leaves dropped.
Is the tree stressed; environmental issues, watering, pests or disease?
Are there markings on the leaves?
These articles may help you pinpoint the issue.
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-pests-and-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-tree-growing.htm
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-anthracnose-treatment.htm
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-algal-leaf-disease.htm