Tank mates for a tiger salamander?

hello,i have a 6inch tiger salamander in a 12"X12" tank (obviously im going to upgrade in a few months) and i was curious if there is ANY sort of tank mate i can keep with him besides another tiger salamander. i love my Tiger sal., but i kinda want anotherr amphibian with her. i have a huge log pointing up from one end to the next, (perfect for frogs to stay out of the tigers way) and eco earth. the temp varies from 67F - 74F. i try to keep it cool. any sort of temparay or permanent tank mate? (temparay meaning a year or so, i have a buddy who loves any animal and would take it). salamanders/frogs are prefered animals i want with her, thank you!