There is a great idea for implementation in the cryptosphere, but I am a beginner developer and I do not have enough funds to afford the creation of a token on ETH. (unjustifiably large commissions with a high price of the Ethereum itself)
Is there some kind of cross-blockchain to implement my ideas with very low fees?

Mate, you should not using mainnet blockchain if you want to develop and test your application.
Try testnet blockchain, you can find Ropsten network if you want to use ETH blockchain, it is a testnet blockchain.
Or if you want to use a cheaper mainnet blockchain than ETH, try use Binance smart chain.