The hollow lip roll is a powerful, two-toned, low, and toad-like lip roll sound that can be coupled with a vocalization.
How it's done
- Hollow your throat by dropping your adam's apple and creating a space in your throat or creating a pocket of air in your throat and act as if you were swallowing it
- Do an inward lip roll
- Elongate the lip roll while creating the hollow space in your throat
