Regrow organ

If you mean which cells in a lizard’s tail resemble or enable regeneration, the key cells are:

• Blastema cells — a mass of proliferating, progenitor-like cells that forms at the wound and helps rebuild the tail.
• Muscle satellite cells — contribute to regeneration of skeletal muscle.
• Fibroblasts — produce connective tissue and extracellular matrix.
• Epidermal cells — regenerate the outer skin.
• Blood-vessel cells — help rebuild vascular tissue.
• Nerve-associated cells — support regeneration and signaling.
• Stem/progenitor-like cells — provide cells for several regenerating tissues.

A lizard's regenerated tail is not an exact copy of the original: it typically has regenerated cartilage-like tissue rather than the original vertebral bones, different muscle organization, and a different arrangement of scales.

If you're asking about what human cells are most similar to lizard tail regenerative cells, the closest functional comparison is human adult stem/progenitor cells and satellite cells, although their regenerative abilities are much more limited.