There are several ALTcoins that are backed gold. For example: DigixGlobal, AurumCoin, OneGram.
In addition to these there are several altcoins pegged to USD. Tether (Centralized), MakerDAO, TrueUSD, BitUSD. There is a cryptocurrency pegged to mining energy (stablecoin with limitations on maximum processing power) but I cannot remember the name. Rare Pepe assets have been minted as physical cards. Precious coins with BTC/LTC/DOGE encrypted within. Perhaps more but that's what I am aware of personally.
Thank you

we never know about Rare Pepe minted into physical cards before. Quite interesting, will look into it. Anyone else?
Has anyone ever heard of crypto backed agro commodities perhaps?