Synonyms to elf child

changeling, agent, alternate, alternative, analogy, backup, change, comparison, copy, counterfeit, deputy, double, dummy, equal, equivalent, ersatz, exchange, fake, fill-in, ghost, ghostwriter, imitation, locum tenens, makeshift, metaphor, metonymy, next best thing, personnel, phony, pinch hitter, proxy, relief, replacement, representative, reserves, ringer, second string, secondary, sign, spares, stand-in, sub, substituent, substitute, substitution, succedaneum, superseder, supplanter, surrogate, symbol, synecdoche, third string, token, understudy, utility player, vicar, vice-president, vice-regent