Not if you want to stick to using lightning:recordForm, because the 'linkifying' comes standard with Salesforce fields and there is nothing one can do about it. But you have options. Have you looked at lightning:recordEditForm? You could create a new generic component that handles iframe which you can embed within the parent component.
iFrame.cmp
<aura:component implements="forceCommunity:availableForAllPageTypes,flexipage:availableForAllPageTypes,force:hasRecordId,force:hasSObjectName">
<aura:attribute name="recordId" type="String"/>
<aura:attribute name="rootURL" type="String" default="" required="true"/>
<aura:attribute name="frameWidth" type="String" default="100%"/>
<aura:attribute name="frameHeight" type="String" default="600px"/>
<aura:attribute name="allowScrolling" type="String" default="yes"/>
<aura:attribute name="includeIdInURL" type="Boolean" default="false"/>
<aura:attribute name="parameter1Name" type="String" default=""/>
<aura:attribute name="parameter1Value" type="String" default=""/>
<aura:attribute name="parameter2Name" type="String" default=""/>
<aura:attribute name="parameter2Value" type="String" default=""/>
<aura:attribute name="parameter3Name" type="String" default=""/>
<aura:attribute name="parameter3Value" type="String" default=""/>
<aura:attribute name="parameter4Name" type="String" default=""/>
<aura:attribute name="parameter4Value" type="String" default=""/>
<aura:attribute name="parameter5Name" type="String" default=""/>
<aura:attribute name="parameter5Value" type="String" default=""/>
<aura:if isTrue="{!!empty(v.rootURL)}">
<iframe scrolling="{!v.allowScrolling}" src="{!v.rootURL + '?' + v.parameter1Name + '=' + v.parameter1Value + '&' + v.parameter2Name + '=' + v.parameter2Value + '&' + v.parameter3Name + '=' + v.parameter3Value + '&' + v.parameter4Name + '=' + v.parameter4Value + '&' + v.parameter5Name + '=' + v.parameter5Value + '&output=embed' + if(v.includeIdInURL, '&id=' + v.recordId, '') }" width="{!v.frameWidth}" height="{!v.frameHeight}" style="border:none;"></iframe>
<aura:set attribute="else">
No URL specified.
</aura:set>
</aura:if>
</aura:component>
And then use it like so in:
lightning:recordEditForm
<aura:component>
<lightning:recordEditForm
recordId="a00R0000000jq5eIAA"
objectApiName="Kal__c">
<!-- the messages component is for error messages -->
<lightning:messages />
<lightning:inputField fieldName="Name" />
<lightning:inputField fieldName="Address_c" />
<lightning:inputField fieldName="Phone__c" />
<c:iFrame rootURL="https://www.google.com"/>
<div class="slds-m-top_medium">
<lightning:button disabled="{!v.disabled}" variant="brand" type="submit" name="save" label="Save" />
</div>
</lightning:recordEditForm>
</aura:component>