I don't understand why TOMOCHAIN is in the Token altcoins section is this built on top of Ethereum or something?
I thought this was its own unique chain?
What do you mean? Where is TomoChain called a token?
During the ICO TOMO was sold as an ERC-20 Ethereum token, but since the mainnet launch in december 2018 it's a coin with an own Blockchain and all ERC-20 TOMO token were converted to the mainnet and the ERC-20 token were frozen.
TomoChain is also EVM (Ethereum virtual machine) compatible, this means that every dApp that runs on the Ethereum Blockchain can also run on TomoChain, still TomoChain is a unique Blockchain.