Foods used as phones
From Homestar Runner Wiki
Foods being used as phones is a common habit that Homestar Runner has. He appears to use it with foods he likes, and doesn't understand the fact that these items aren't actually phones.
Appearances
Where the Crap Are We? Homestar uses a twinkie as a phone to call "Senator Pencilface". Marzipan's Answering Machine Version 13.2 Homestar uses a banana that he thinks is Pom Pom's cell phone to text message Marzipan.