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someone else may know something i don't here, but since those log groups aren't created until the function executes i don't believe Pulumi would have any way of knowing they exist or what they're named

Ah, hm, so it's entirely an AWS thing

sure thing

You have to create the log group after the Lambda function and explicitly set a dependency. In Python:

my_lambda_log_group = aws.cloudwatch.LogGroup(
    "my-lambda",
    retention_in_days=30,
    name=my_lambda.name.apply(
        lambda name: f'/aws/lambda/{name}'
    ),
    opts=pulumi.ResourceOptions(depends_on=[my_lambda])
)

This way it's also possible to set e.g. retention which would otherwise be 1 month by default.