The Predacons are some big techno-organic Transformers that include Blackarachnia and Waspinator, but they are, so far, the only two. Each of them transforms into bugs (not counting Blackarachnia since spiders are technically arachnids and not bugs). And yet they manage to not get squished.
Wasp was being chased by the Autobots until Swoop rescued him and carried him to Dinobot Island, where he meets Blackarachnia, who offers to make him a Techno-Organic like herself so he can fight the Autobots. She infuses him with wasp DNA, resulting in Wasp's transformation into Waspinator. He later finds out that she was just using him. Predacons Rising
By far, the members of the Predecons are all former Auotbots.