Yes, there are a few Dumbles and Dumble clones. Idk if you know this, but there are a few boutique amp makers who produce ONLY copies of Dumble amps. The main amp that alexander dumble made was the Overdrive Special, but he made little tweaks and modifications to lots of those Dumble amps. Another famous Dumble amp was the Steel String Singer, which is what Stevie Ray Vaughan used as well as John Mayer which was a VERY LOUD, but pretty clean amp. I know one guy made a tutorial on how to emulate the SSS with an Ampeg model that sounds really good.
But to answer your question, there are a BUNCH of Dumble type amp models. There is the actually Dumble Overdrive Special, there is a mode of Robben Fords personal Dumble ODS-100, there is a model of the Bludotone Ojai which is a copy of Robben Ford’s Dumble. Fuchs makes the Overdrive Supreme, two rock makes Dumble clones. The BEST Dumble style amp, which is even better than a Dumble in many people’s opinions, is the Carol-Ann Tucana. All the Carol-Ann stuff is similar to the Dumble amps, but they’re all a little different. Dumble only made somewhere around 300 amps and he voiced them differently for each customer.
Here is an older list and explanations of many of the fractal models. The list is a little different now, but this is basically it.
https://www.dropbox.com/s/8fvjvrqnryihp86/Yeks_Guide_to_the_Fractal_Audio_Amp_Models.pdf