What kinds of temporary prostheses/mobility aids could be used by a lizardfolk/salamander-like alien race who *can* regenerate lost limbs, but only slowly and will have to need assistance for at least about two or three months while the new limb grows in?
since the limb is growing back, it certainly wouldn't do to have the prosthetic cover up the stump and block its growth. so they would probably invent hollow prosthetics instead! for weight bearing, and to prevent it from sliding around, it would need to be strapped around the body in a way that doesn't put too much strain on the healing limb.
(image description: sketch of a bipedal lizard person wearing prosthetics over one arm and one leg to cover them while they regrow. the prosthetics are sketched in red and have many straps keeping them attached to the body. end description)
they would also want a cane or crutch for a while if they're missing a leg. they could just opt for crutches or even a wheelchair and not use a prosthetic at all! missing arms also may not require a prosthetic. if they need extra protection from cuts and infection during the regrowth but they don't want a prosthetic, they could perhaps just wear a soft and stretchy material over the limb, like a real big sock. this would also help with temperature regulation, and it would be useful under a prosthetic for comfort reasons.