Proud Parent to 2 Pekin Ducks....Are they supposed to grow this fast??

[idlenoise]

Hi everyone. I am completely new to owning ducks, and posting...I hope I have posted in the right place. I have never owned any chickens or ducks and after meeting a man locally w/a pet duck I was intrigued. I brought home my babies (still with an "egg tooth") 3 weeks ago and they are HUGE. They are starting to get feathers/losing their yellow "fluff". They have been in the house and there were a a few days where I was wondering what I had gotten myself into.....mess/laundry wise. But they have gotten accustomed to a routine and things have started becoming easier (messes bigger but I am more prepared). SO I bought them from tractor supply and the salesperson said they were Pekins (I had wanted Cayugas but I quickly shifted gears) There beaks were orange for the first week but have turned more of a pale pink and they have tripled in size (they can jump the 1 foot kitchen fence easy) Now I am wondering, are they Pekins or a cross-breed? And if they are Pekins are they jumbo? When I see pictures of Pekins I see their bright orange beak and these do not look like that. I have a ton of pictures but have not posted them as of yet. Their sounds have also recently changed...one makes a chirping/peeping sound and the other more of a clucking/belly sound. Also..(and this is cute) one sort of whistles like "hey you" (the type of whistle like "over here!" that people do....if that makes sense) I joke that I am at their "beak and call" when they start using the whistle (but I am)...So how can I tell if these are Jumbo pekins? Does anyone have pictures of a jumbo and a pekin next to each other at 3 weeks old? And should I be supplementing their chick food, is that why their beaks are pale pink or is it something else. They are very friendly....and get very excited when I talk to them. They love being held although they like to run away a little first. When they do, I walk away and they run behind me. Very cute Any help would be great. Thank you!!!

Oh and their names are Chopper and Violet (I have no idea what sex they are but I'm assuming by what I read that their sound and tail feathers will let me know soon enough).

 

[MountainDucks]

We got our first 2 ducks 4 weeks ago when they were three days old. Each of them could fit in your palm. They've grown soooo much in 4 weeks they barely fit together in my lap. I took them to a vet for a check-up and he said they were perfectly normal. I can see a noticeable difference in their size each morning and even when I get home from work.

My ducks are Lucy and Sara.