Again we have Dino Martens designing tutti frutti, and this time we even have him designing for AVeM in the 1940s. I wrote Marc Heiremans, a Martens expert, last year to ask if Dino had designed these type pieces. His answer was no.
I have a hard time telling the tutti frutti bowls from each other. Some that I "knew" were made by AVeM turned out to be made by Ferro Italarts, Fratelli Toso, JI Co, or other places. The seller in this case attributed the clam shaped bowl to F. Toso, but said the label once read Ferro Italarts. So if they are indeed a matched set, I would say Ferro.
If I did not know anything about tutti frutti, I would have certainly been convinced. Fratelli Toso did do some bowls that looked very much like these two, but I wouldn't be surprised if almost every company made "end of day" pieces that looked like them. I am surprised, though, that the seller would read Ferro and translate it to Fratelli Toso, maybe because one of the Vittorio Ferros worked for Toso.