The letters can be used to spell the 4 letter words main, mana, mini and pain. They also spell the 3 letter words aah, aim, bam, ban, bin, ham, him, hip, man, map, nap, pan and pin.
A four letter amphibian is a frog.
newt
Amphibian(type of animal) or mammalian
4. am-phi-bi-an
Salamander? It's a type of amphibian but I don't know if that's what you are looking for. If it isn't, sorry.
amphibian
Amphibian is stressed on the second syllable.
Urocordylus is an extinct amphibian. It begins with the letter u.
Newt is a four letter animal. It is a small amphibian.
Quasicaecilia is an extinct amphibian. It begins with the letter Q.
none there is no amphibian starting with n
Plains Leopard Frog is an amphibian. It begins with the letter p.
frog.