All tokens that were not migrated at all (still in Ethereum accounts) or were incorrectly sent directly to the ethereum token contract are part of “migration phase 4”. It is described here including some instructions on how to get your tokens.
@emin.chain has also made a nice video where he goes through the entire process (it is the same for frozen tokens as for misplaced tokens): [VIDEO] How to access your non-transferable ERC-20 AE token on aeternity Mainnet (LIMA)