I think it could be bagworm or bagmoths or case moth larvae. This insect belongs to Psychidae family. The caterpillars construct cases using silk and sand, soil, lichen, or plant materials. The cases are found attached to trees, fences or rocks when the larvae is resting or during the pupal stage. The caterpillar moves with the case attached from one place to other and feeds on lichen or green leaves. It is not a serious pest and can be controlled by hand picking the cases and destroy them.
https://en.wikipedia.org/wiki/Bagworm...