A toad's tongue is generally soft and moist, with a slightly sticky texture that helps it catch prey. It is typically long and flexible, allowing the toad to quickly extend it to capture insects and other small animals. The surface may feel smooth, but the stickiness can create a unique sensation when touched. Overall, it is adapted for efficient feeding rather than for tactile exploration.
muscles/reflex
Yes, toads are capable of feeling pain.
in the front of the mouth
Both frogs and toads will stick their tongue out. This is done so that they may catch and eat insects.
Frogs and toads use their tongue to catch insects, but some species prefer to hide and wait for an unsuspecting prey and then pounce.
bumpy yet smooth.
so they can reach the flies (which the eat)
Yes, toads do eat nightcrawlers. They are opportunistic feeders and primarily consume a diet of insects, worms, and other small invertebrates. Nightcrawlers, being large earthworms, are a suitable food source for toads, especially since toads have a long, sticky tongue that allows them to catch and consume these worms easily.
You might try a mouth wash and/or a tongue scraper.
Because they feel like having a long tongue.
Lingual Frenulum - the little string you can feel under your tongue
No toads do not sting. They don't have stingers in their bodies. Some toads are poisonous and their poison might feel like a sting if you touch them, However further research is needed to see if this is true.