Your inquiry made me interested, is it possible that an angel and ram were crossed? I would have to say, "It doesn't seem possible." You sort of described a "Balloon Ram" which is a strain of the common Mikrogeophagus ramirezi (German Blue Ram) which was inbred to excentruate body proportions. Here is a link to a site devoted to the "Balloon Ram" (http
/www.geocities.com/yutaka_loo/). The main contention that I have with the theory of a "ramirezi" mating or at the least, crossed via artificial insemination or other means, with an angel (Pterophyllum scalare) is that their genera are so far diverging and that there is an unusually high amount of genetic divergence, when compared to African cichlids as outlined by I.P. Farias et. al. in the link included (golab.unl.edu/publications/Farias-JME1999.pdf)- look at page 709, under the caption "High Rate of Molecular Evolution of South American Cichlids." But on the other side of the argument, the other people who I have seen posting essentially the same question said that their LFS employees stated that the fish were hybrid results of crossed angels and rams. Here's another of those angel rams (http
/www.aquariumadvice.com/photopost/showphoto.php?photo=9349&cat=534), but "possible- yes, for all intensive purposes, probable- no." If it is a balloon ram, or a variant strain of a blue ram they are probably very difficult to keep alive (rams are inbred enough without purposefully trying to selectively inbreed- i.e. common spinal afflictions) due to a quick development of "alien" body types without evolutionary (selective fitness) constraints (quick as in, under 30 years). On the other hand, if they are hybrids, then they are probably mules (sterile), since the parent species are from relatively "far" relating genera, although I. P. Farias et. al. consider the genera relatively close while genetically divergent (in cichlid terms).
Hopefully that wasnt too confusing. And as far as hearing of them before, nope cant say I have... but I have seen and heard of the Balloon Rams before and know that they are pretty sought after, albeit commonly sterile and genetically mal-afflicted.