Yes, you can grow Plumeria (Frangipani) from seeds collected from hybrid varieties. However, there are a few important things to keep in mind when growing Plumeria from hybrid seeds:

1. Genetic Variation: Plumeria hybrids are the result of crossbreeding different Plumeria species and varieties. When you grow Plumeria from seeds collected from hybrid varieties, the resulting plants may exhibit a wide range of characteristics. These characteristics can vary in terms of flower color, fragrance, size, and growth habit.
2. Unique Variations: Growing Plumeria from hybrid seeds can lead to the development of unique and interesting variations. You may discover new color combinations or flower shapes that are not present in the parent plants.
3. Patience: Plumeria grown from seeds, including hybrid seeds, take time to mature and bloom. It can take several years for seed-grown Plumeria to reach maturity and produce flowers.
4. Unpredictability: Due to the genetic diversity resulting from hybrid seeds, the exact appearance of the mature plants may be unpredictable. You may need to wait until they bloom to see their final characteristics.
5. Hybrid Characteristics: While hybrid seeds can produce a wide range of variations, they will generally retain some of the characteristics of the parent hybrid plants. For example, if you collect seeds from a hybrid known for its vibrant flower colors, the resulting plants are likely to have colorful blooms as well.
6. Caring for Seedlings: Ensure that you provide proper care for the seedlings, including appropriate light, temperature, and moisture levels, to help them grow into healthy and vigorous plants.
7. Selective Breeding: If you have a specific goal in mind, such as creating your own unique Plumeria hybrid, you can selectively breed Plumeria plants by hand-pollinating flowers from different parent plants to control the genetic outcome.

In summary, growing Plumeria from seeds collected from hybrid varieties is a fascinating and rewarding endeavor that can lead to the development of new and unique Plumeria plants. While the outcome may be somewhat unpredictable due to genetic variation, it can result in the creation of beautiful and distinct Plumeria specimens.