Can AWS Code Whisperer write Terraform Code?

Support for Terraform, as well as CloudFormation, and CDK was announced for re:Invent 2023: https://aws.amazon.com/about-aws/whats-new/2023/11/amazon-codewhisperer-new-enhancements/

See the CodeWhisperer FAQ https://aws.amazon.com/codewhisperer/faqs/

CodeWhisperer currently supports Python, Java, JavaScript, TypeScript, C#, Go, Rust, PHP, Ruby, Kotlin, C, C++, Shell scripting, SQL and Scala.

No it does not support writing Terraform code as of now.

Now Code Whisperer supports Terraform! https://www.hashicorp.com/blog/accelerate-your-terraform-development-with-amazon-codewhisperer

The updated list has HCL/terraform now. https://docs.aws.amazon.com/codewhisperer/latest/userguide/language-ide-support.html