Have been looking for a "tinySG" on this thread. Attached below is a posting on the WB-SG1 that can be seen on ebay along with a review. Not very good, just a frequency source.
I found this one as another possible "tinySG":
The ERASynth-micro is more featured, with AM and FM modulation and variable amplitude. The output waveform is not pure. The review in the link above mentions a couple gripes about the GUI. These have been fixed in a second batch of units to start delivery in January. I ordered one for myself from Crowd Supply and will let the group know when/if it arrives and how it performs. The cost is higher than tinySA or nanoVNA variants, but still affordable by hobbiests.
Dan
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