Yes, Snapshot supports EIP-6492, a standard specifically created for undeployed smart contract wallets, also known as counterfactual wallets.
EIP-6492 provides a standardized method to verify signatures from smart contract wallets before they are deployed onchain. These counterfactual wallets have their addresses determined in advance, enabling users to participate in governance activities, such as voting and proposal creation on Snapshot, without initially deploying their wallet contracts and incurring deployment costs.
For more detailed information on EIP-6492, visit the official page: https://eips.ethereum.org/EIPS/eip-6492.