Bash-Chelik is a Turkish word and it means Iron Head. Bash-Chelik is also a first Serbian boardgame based on same folk story and Slavic mythology.
In 1950, BasCelik was the villain of Cutotvorni Mac (The Wonderful Sword, sometimes rendered The Magic Sword, but not to be confused with the much later Bert I. Gordon film) a film by Vojislav Nanovic. In this film, BasCelik could only be slain by a particular sword. In the original legend, no weapon could harm him. Only denying him water would reduce his strength.
BasCelik is part of the Monster in My Pocket series, appearing in the centerspread of issue #3 with the spelling "Bash Tchelik". There does not appear to have been a toy version, however.
BasCelik is very similar, especially with the repeatedly nested items holding his soul, to Koschei the Deathless.