Yes, the "grubs"/insects that Pumbaa and Timon feast on.
Producers in The Lion King would be the sun and the plants, while the decomposers would probably be the grubs (bugs) that Timon and Pumbaa eat.
bacteria, fungi, earthworm etc.
The grubs and the bugs that Timone and Pumbaa eat.
lil lion simba, big yellow one is mufasa and black one is scar