Described herein are intra-oral prostheses that can help replace or augment the function of the native tongue, such as to assist with swallowing. Disclosed prostheses can provide mechanical force, based on the power of mastication, to propel a food bolus into the pharyngeal phase of swallowing. Disclosed prostheses can be used to enhance swallowing rehabilitation as a temporary aid and/or can be used to permanently replace lost tongue functionality. Also disclosed are other anatomical prostheses, such as to provide power for the articulation of dysfunctional extremities, by transforming mechanical force from another nearby functioning muscle group.