Are soft toys (a plush rabbit) suitable in the cot for a 10 month old? What about the Riff Raff toys - are they okay to have in the cot while baby is sleeping?

Red Nose recommends withholding any soft toys/comforters for babies less than 7 months of age.
This is because of the risk of covering baby’s head & face, increasing the risk of suffocation.

Keep soft toys out of the sleeping environment for babies under seven months of age because they may cover the nose and mouth and interfere with breathing.

The risk posed by suffocation by the presence of soft objects in the baby’s sleeping environment outweighs any benefit to the baby from a soft toy. It is therefore advised not to place soft toys and other soft objects in the cot for babies under seven months of age.

Seven-month-old babies are more likely to explore objects in their sleeping environments than younger babies. Some babies over seven months of age may appreciate a small object such as a soft toy to provide comfort and connection (transitional object) during times of separation from their parent.

Soft toys should never be placed in the sleeping environment of an infant under seven months of age.
Soft objects in the cot can be a suffocation risk. Physiological studies indicate that facial obstruction by soft bedding may lead to complete airway obstruction, and/or hyperthermia, and/or accidental suffocation by rebreathing
https://rednose.org.au/article/soft-toys-in-the-cot