---

All answers having "Fountain treat" as clue:

4 Character Answers:

---

COLA

MALT

SODA



5 Character Answers:

---

SHAKE



6 Character Answers:

---

FRAPPE

MALTED

SUNDAE



8 Character Answers:

---

ICECREAM



10 Character Answers:

---

MALTEDMILK



11 Character Answers:

---

BANANASPLIT



12 Character Answers:

---

VANILLASHAKE



15 Character Answers:

---

CHOCOLATEMALTED

VANILLAICECREAM