I feed hibiscus flowers as treats to all my vegetarian herps. They always have a good amount of pollen on the stamens/anthers. I prefer this to bee collected pollen because you don't know what kind of flower the bee collected pollen comes from. Many reputable uro breeders have noted an increase in appetite after feeding pollen. Hibiscus also helps get a newly aquired stressed animal feeding.
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-Jake
0.0.1 Uromastyx geyri
0.1 L.t. annulata
1.1 L.g. californiae
2.1 Pseudemys nelsoni
1.0 Geochelone sulcata
0.1 mexican double yellowheaded amazon parrot