Internal buds of spongilla are called Gemmules/Gemmae.

Explanation

**Step-by-Step Solution:**

1. **Understanding Spongilla**: Spongilla is a genus of freshwater sponges that belong to the phylum Porifera. They are known for their simple body structure and ability to filter water.

2. **Identifying Internal Buds**: The question asks about the internal buds of Spongilla. In sponges, internal buds are structures that allow for asexual reproduction.

3. **Naming the Internal Buds**: The internal buds of Spongilla are specifically called "gemmules." These structures are crucial for the survival and reproduction of the sponge.

...