The past tense of chuck one's toys out of the pram is chucked one's toys out of the pram.
The third-person singular simple present indicative form of chuck one's toys out of the pram is chucks one's toys out of the pram.
The present participle of chuck one's toys out of the pram is chucking one's toys out of the pram.
The past participle of chuck one's toys out of the pram is chucked one's toys out of the pram.