1. Space problem: The piglet may feel that the space is too small for it to move freely. It may need more space to move around and explore.

2. Environmental problem: If the environment of the toilet is not comfortable for the piglet, it may express its dissatisfaction by grunting. For example, if the toilet is too wet or poorly ventilated, or if there is poor hygiene in the toilet, these may make the piglet uncomfortable.

3. Socialization problem: The piglet may need to develop close relationships with humans or other animals in order to feel safe and emotionally supported. If it does not receive enough attention and companionship, it may feel lonely and uneasy.

4. Health Problems: If the piglet has recently had a medical condition or health problem, it may express pain or discomfort by grunting.

To solve the problem of squealing piglets, you can try the following:

1. Provide more space: If you have enough space, you can consider providing a bigger living environment for the piglets to move around freely.

2. Improve the environment: You can improve the environment of the toilet, such as keeping it hygienic, keeping it dry and ventilated, adding some toys that the little fragrant pig likes and so on.

3. Increase social interaction: You can increase the interaction time with the piglet, such as playing with it and providing it with enough attention and companionship.

4. Health check: If you suspect that your piglet has a health problem, you can take it to the vet for a checkup.

I hope these tips will help you to solve the problem of squealing piglets.